Take account of not finding a response in writeComplete #385

src/MQTTAsync.c

@@ -1080,7 +1080,9 @@ static void MQTTAsync_writeComplete(int socket)
 					break;
 			}
 
-			if (cur_response && command->onSuccess)
+			if (cur_response) /* we found a response */
+			{
+				if (command->onSuccess)
 				{
 				  MQTTAsync_successData data;
 
@@ -1093,11 +1095,11 @@ static void MQTTAsync_writeComplete(int socket)
 				  Log(TRACE_MIN, -1, "Calling publish success for client %s", m->c->clientID);
 				  (*(command->onSuccess))(command->context, &data);
 			  }
-			m->pending_write = NULL;
-
 				ListDetach(m->responses, com);
 				MQTTAsync_freeCommand(com);
 			}
+			m->pending_write = NULL;
+		}
 	}
 	FUNC_EXIT;
 }