rocr: fix nullptr dereference (#262)

* rocr: fix nullptr dereference

Return early in the case that malloc fails to avoid dereferencing of a
null pointer on eventDescrp.

Signed-off-by: Sunday Clement <Sunday.Clement@amd.com>

* rocr: Fix potential nullptr dereference

returns early if sym->section() fails to properly acquire the object.

Signed-off-by: Sunday Clement <Sunday.Clement@amd.com>

---------

Signed-off-by: Sunday Clement <Sunday.Clement@amd.com>
Co-authored-by: Sunday Clement <Sunday.Clement@amd.com>

projects/rocr-runtime/runtime/hsa-runtime/core/util/lnx/os_linux.cpp

@@ -539,6 +539,8 @@ typedef struct EventDescriptor_ {
 EventHandle CreateOsEvent(bool auto_reset, bool init_state) {
   EventDescriptor* eventDescrp;
   eventDescrp = (EventDescriptor*)malloc(sizeof(EventDescriptor));
+  
+  if(!eventDescrp) { return nullptr; }
 
   pthread_mutex_init(&eventDescrp->mutex, NULL);
   pthread_cond_init(&eventDescrp->event, NULL);