Fixing compilation errors related to MUSL libc

Fix Musl libc NULL errors and unsupported pthread funcs for compatibility.
Also ensures cleanup and error handling irrespective of CPU affinity override.

Fix submitted by github dev - AngryLoki
https://github.com/ROCm/ROCR-Runtime/issues/181

Change-Id: Ia487315e504112be5d3370756f23f6e23b9ae4be


[ROCm/ROCR-Runtime commit: bc9cac97fe]

projects/rocr-runtime/runtime/hsa-runtime/image/util.h

@@ -99,7 +99,7 @@ static __forceinline void* _aligned_malloc(size_t size, size_t alignment) {
   return aligned_alloc(alignment, size);
 #else
   void* mem = NULL;
-  if (NULL != posix_memalign(&mem, alignment, size)) return NULL;
+  if (0 != posix_memalign(&mem, alignment, size)) return NULL;
   return mem;
 #endif
 }