Return error from hipMallocManaged for size =0

Change-Id: Ida0cecf05e1df731176d41e59422d1e606cc9bd9


[ROCm/clr commit: 236ef94166]

projects/clr/hipamd/rocclr/hip_hmm.cpp

@@ -59,7 +59,7 @@ static_assert(static_cast<uint32_t>(hipMemRangeAttributeLastPrefetchLocation) ==
 hipError_t hipMallocManaged(void** dev_ptr, size_t size, unsigned int flags) {
   HIP_INIT_API(hipMallocManaged, dev_ptr, size, flags);
 
-  if ((dev_ptr == nullptr) || (flags != hipMemAttachGlobal)) {
+  if ((dev_ptr == nullptr) || (size == 0) || (flags != hipMemAttachGlobal)) {
     HIP_RETURN(hipErrorInvalidValue);
   }
 
@@ -213,4 +213,4 @@ static hipError_t ihipMallocManaged(void** ptr, size_t size) {
   ClPrint(amd::LOG_INFO, amd::LOG_API, "%-5d: [%zx] ihipMallocManaged ptr=0x%zx",  getpid(),
     std::this_thread::get_id(), *ptr);
   return hipSuccess;
-}
+}