SWDEV-300934 - Check if the stream is valid

Change-Id: I41797dc3e726c7eea6a405f20deebd6f59381b5e

hipamd/src/hip_hmm.cpp

@@ -80,6 +80,10 @@ hipError_t hipMemPrefetchAsync(const void* dev_ptr, size_t count, int device,
     HIP_RETURN(hipErrorInvalidValue);
   }
 
+  if (!hip::isValid(stream)) {
+    HIP_RETURN(hipErrorContextIsDestroyed);
+  }
+
   size_t offset = 0;
   amd::Memory* memObj = getMemoryObject(dev_ptr, offset);
   // Return error if count passed is more than the actual size allocated