SWDEV-305946:add null pointer check

Signed-off-by: sdashmiz <shadi.dashmiz@amd.com>
Change-Id: I4e466dfd15123276537c47548fbdfb37c5c230df

hipamd/src/hip_graph.cpp

@@ -371,6 +371,9 @@ hipError_t hipStreamEndCapture(hipStream_t stream, hipGraph_t* pGraph) {
 
 hipError_t hipGraphCreate(hipGraph_t* pGraph, unsigned int flags) {
   HIP_INIT_API(hipGraphCreate, pGraph, flags);
+  if ((pGraph == nullptr) || (flags != 0)) {
+    HIP_RETURN(hipErrorInvalidValue);
+  }
   *pGraph = new ihipGraph();
   HIP_RETURN(hipSuccess);
 }