Revert "Fix Coverity dereference before null check issue (intel#13456)…

…" (intel#13818)

This reverts commit c02f915 since this
Coverity issue is a false positive. `EventImpl` is always set when we
pass it in the runtime, but the previous change suggests it might be
null. The Coverity hit should be ignored instead.

sycl/source/detail/graph_impl.hpp

@@ -940,7 +940,7 @@ class graph_impl {
   void addEventForNode(std::shared_ptr<graph_impl> GraphImpl,
                        std::shared_ptr<sycl::detail::event_impl> EventImpl,
                        std::shared_ptr<node_impl> NodeImpl) {
-    if (EventImpl && !(EventImpl->getCommandGraph()))
+    if (!(EventImpl->getCommandGraph()))
       EventImpl->setCommandGraph(GraphImpl);
     MEventsMap[EventImpl] = NodeImpl;
   }