Revert "SWDEV-315402: Null param check for pGraphNode"

This reverts commit bc59991924.

Reason for revert: want to add one more check

Change-Id: I02b621d0c98b9000f75ea214cf5b4967cfaee95d


[ROCm/clr commit: f8f8b0fd95]

projects/clr/hipamd/src/hip_graph.cpp

@@ -1640,8 +1640,7 @@ hipError_t hipGraphAddEventWaitNode(hipGraphNode_t* pGraphNode, hipGraph_t graph
                                     const hipGraphNode_t* pDependencies, size_t numDependencies,
                                     hipEvent_t event) {
   HIP_INIT_API(hipGraphAddEventWaitNode, pGraphNode, graph, pDependencies, numDependencies, event);
-  if (pGraphNode == nullptr || graph == nullptr || (numDependencies > 0 && pDependencies == nullptr)
-      || event == nullptr) {
+  if (graph == nullptr || (numDependencies > 0 && pDependencies == nullptr) || event == nullptr) {
     HIP_RETURN(hipErrorInvalidValue);
   }
   *pGraphNode = new hipGraphEventWaitNode(event);