Fix musl errors:
* reinterpret_cast from 'std::nullptr_t' to 'void **' is not allowed
* error.h is GNU extension

Upstream PR: https://github.com/ROCm/hip-tests/pull/463
--- a/unit/rtc/headers/printf_common.h
+++ b/unit/rtc/headers/printf_common.h
@@ -30,7 +30,6 @@ THE SOFTWARE.
 #if defined(_WIN32)
 #include <io.h>
 #else
-#include <error.h>
 #include <unistd.h>
 #endif
 
@@ -110,7 +109,7 @@ struct CaptureStream {
     saved_fd = dup(orig_fd);
 
     if ((temp_fd = mkstemp(tempname)) == -1) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
   }
@@ -118,11 +117,11 @@ struct CaptureStream {
   void Begin() {
     fflush(nullptr);
     if (dup2(temp_fd, orig_fd) == -1) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
     if (close(temp_fd) != 0) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
   }
@@ -130,11 +129,11 @@ struct CaptureStream {
   void End() {
     fflush(nullptr);
     if (dup2(saved_fd, orig_fd) == -1) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
     if (close(saved_fd) != 0) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
   }
@@ -148,7 +147,7 @@ struct CaptureStream {
 
   ~CaptureStream() {
     if (remove(tempname) != 0) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
   }
--- a/unit/memory/hipMemRangeGetAttributes_old.cc
+++ b/unit/memory/hipMemRangeGetAttributes_old.cc
@@ -268,7 +268,7 @@ TEST_CASE("Unit_hipMemRangeGetAttributes_NegativeTst") {
     // Passing NULL as first parameter
     SECTION("Passing NULL as first parameter") {
       if (!CheckError(hipMemRangeGetAttributes(
-                                      reinterpret_cast<void**>(NULL),
+                                      static_cast<void**>(NULL),
                                       reinterpret_cast<size_t*>(dataSizes),
                                       AttrArr, 4, Hmm, MEM_SIZE),
                                       __LINE__)) {
--- a/unit/occupancy/hipOccupancyMaxActiveBlocksPerMultiprocessor_old.cc
+++ b/unit/occupancy/hipOccupancyMaxActiveBlocksPerMultiprocessor_old.cc
@@ -40,7 +40,7 @@ TEST_CASE("Unit_hipOccupancyMaxActiveBlocksPerMultiprocessor_Negative") {
   ret = hipOccupancyMaxActiveBlocksPerMultiprocessor(NULL, f1, blockSize, 0);
   REQUIRE(ret != hipSuccess);
 
-  ret = hipOccupancyMaxActiveBlocksPerMultiprocessor(&numBlock, NULL, blockSize, 0);
+  ret = hipOccupancyMaxActiveBlocksPerMultiprocessor(&numBlock, static_cast<void*>(NULL), blockSize, 0);
   REQUIRE(ret != hipSuccess);
 
   ret = hipOccupancyMaxActiveBlocksPerMultiprocessor(&numBlock, f1, 0, 0);
--- a/unit/occupancy/hipOccupancyMaxPotentialBlockSize_old.cc
+++ b/unit/occupancy/hipOccupancyMaxPotentialBlockSize_old.cc
@@ -37,7 +37,7 @@ TEST_CASE("Unit_hipOccupancyMaxPotentialBlockSize_Negative") {
 
 #ifndef __HIP_PLATFORM_NVIDIA__
   // nvcc doesnt support kernelfunc(NULL) for api
-  ret = hipOccupancyMaxPotentialBlockSize(&gridSize, &blockSize, NULL, 0, 0);
+  ret = hipOccupancyMaxPotentialBlockSize(&gridSize, &blockSize, static_cast<void*>(NULL), 0, 0);
   REQUIRE(ret != hipSuccess);
 #endif
 }
--- a/unit/occupancy/hipOccupancyMaxActiveBlocksPerMultiprocessor.cc
+++ b/unit/occupancy/hipOccupancyMaxActiveBlocksPerMultiprocessor.cc
@@ -48,7 +48,7 @@ TEST_CASE("Unit_hipOccupancyMaxActiveBlocksPerMultiprocessor_Negative_Parameters
       blockSize);
 
   SECTION("Kernel function is NULL") {
-    HIP_CHECK_ERROR(hipOccupancyMaxActiveBlocksPerMultiprocessor(&numBlocks, NULL, blockSize, 0),
+    HIP_CHECK_ERROR(hipOccupancyMaxActiveBlocksPerMultiprocessor(&numBlocks, static_cast<void*>(NULL), blockSize, 0),
                     hipErrorInvalidDeviceFunction);
   }
 }
--- a/unit/kernel/printf_common.h
+++ b/unit/kernel/printf_common.h
@@ -24,7 +24,6 @@ THE SOFTWARE.
 #define _STRESSTEST_PRINTF_COMMON_H_
 
 #include <errno.h>
-#include <error.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -47,17 +46,17 @@ struct CaptureStream {
     saved_fd = dup(orig_fd);
 
     if ((temp_fd = mkstemp(tempname)) == -1) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
 
     fflush(nullptr);
     if (dup2(temp_fd, orig_fd) == -1) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
     if (close(temp_fd) != 0) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
   }
@@ -67,11 +66,11 @@ struct CaptureStream {
       return;
     fflush(nullptr);
     if (dup2(saved_fd, orig_fd) == -1) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
     if (close(saved_fd) != 0) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
     saved_fd = -1;
@@ -90,7 +89,7 @@ struct CaptureStream {
   ~CaptureStream() {
     restoreStream();
     if (remove(tempname) != 0) {
-      error(0, errno, "Error");
+      fprintf(stderr, "Error: %s\n", strerror(errno));
       assert(false);
     }
   }