Avoid releasing scratch for blit queues

At hsa_shutdown(), scratch_lock_ may be gone. Blit queues don't need it.

Change-Id: Ic132ac8a6be31fb2f0623137115608b0b222f077

runtime/hsa-runtime/core/runtime/amd_aql_queue.cpp

@@ -363,8 +363,9 @@ AqlQueue::~AqlQueue() {
   }
 
   Inactivate();
-  agent_->ReleaseQueueMainScratch(queue_scratch_);
-  agent_->ReleaseQueueAltScratch(queue_scratch_);
+
+  if (queue_scratch_.main_queue_base) agent_->ReleaseQueueMainScratch(queue_scratch_);
+  if (queue_scratch_.alt_queue_base) agent_->ReleaseQueueAltScratch(queue_scratch_);
 
   FreeRegisteredRingBuffer();
   exception_signal_->DestroySignal();