Test that shutdown callback is called when expected.

git-svn-id: https://origsvn.digium.com/svn/asterisk/team/mmichelson/threadpool@376383 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/taskprocessor.c

@@ -565,6 +565,7 @@ struct ast_taskprocessor *ast_taskprocessor_create_with_listener(const char *nam
 void *ast_taskprocessor_unreference(struct ast_taskprocessor *tps)
 {
 	struct ast_taskprocessor_listener *listener;
+
 	if (!tps) {
 		return NULL;
 	}

tests/test_taskprocessor.c

@@ -239,8 +239,16 @@ AST_TEST_DEFINE(taskprocessor_listener)
 		goto test_exit;
 	}
 
+	tps = ast_taskprocessor_unreference(tps);
+
+	if (!pvt->shutdown) {
+		res = AST_TEST_FAIL;
+		goto test_exit;
+	}
+
 test_exit:
 	ao2_ref(listener, -1);
+	/* This is safe even if tps is NULL */
 	ast_taskprocessor_unreference(tps);
 	return res;
 }