rsx: Fix leaking ZCULL queries after a barrier

- Multiple queries can be queued up, process them all before completing the barrier

rpcs3/Emu/RSX/RSXThread.cpp

@@ -3611,7 +3611,11 @@ namespace rsx
 					}
 				}
 
-				update(ptimer, sync_address);
+				// There can be multiple queries all writing to the same address, loop to flush all of them
+				while (query->pending && !Emu.IsStopped())
+				{
+					update(ptimer, sync_address);
+				}
 				return result_none;
 			}