adding a print statement for debugging purposes

Author: oleksandr-pavlyk

dpctl/_sycl_queue.pyx

@@ -907,9 +907,12 @@ cdef class SyclQueue(_SyclQueue):
             else:
                 for idx, de in enumerate(dependent_events):
                     depEvents[idx] = (<SyclEvent>de).get_event_ref()
+        print(nDE)
         ERef = DPCTLQueue_SubmitBarrierForEvents(
             self.get_queue_ref(), depEvents, nDE)
-        free(depEvents)
+        print("submitted")
+        if (depEvents is not NULL):
+            free(depEvents)
         if ERef is NULL:
             raise SyclKernelSubmitError(
                 "Barrier submission to Sycl queue failed."