mesa/main: Add missing null check in _mesa_CreatePerfQueryINTEL()

Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>

src/mesa/main/performance_monitor.c

@@ -1036,6 +1036,11 @@ _mesa_CreatePerfQueryINTEL(GLuint queryId, GLuint *queryHandle)
    }
 
    m = new_performance_monitor(ctx, first);
+   if (m == NULL) {
+      _mesa_error_no_memory(__func__);
+      return;
+   }
+
    _mesa_HashInsert(ctx->PerfMonitor.Monitors, first, m);
    *queryHandle = first;