Take advantage of the fact that stasis_unsubscribe now returns NULL

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@383169 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel_internal_api.c

@@ -1367,8 +1367,7 @@ void ast_channel_internal_cleanup(struct ast_channel *chan)
 
 	ast_string_field_free_memory(chan);
 
-	stasis_unsubscribe(chan->forwarder);
-	chan->forwarder = NULL;
+	chan->forwarder = stasis_unsubscribe(chan->forwarder);
 
 	ao2_cleanup(chan->topic);
 	chan->topic = NULL;

main/manager.c

@@ -7590,8 +7590,7 @@ static void manager_shutdown(void)
 {
 	struct ast_manager_user *user;
 
-	stasis_unsubscribe(channel_state_sub);
-	channel_state_sub = NULL;
+	channel_state_sub = stasis_unsubscribe(channel_state_sub);
 
 	if (registered) {
 		ast_manager_unregister("Ping");

tests/test_stasis.c

@@ -276,8 +276,7 @@ AST_TEST_DEFINE(subscription_messages)
 	ao2_ref(consumer, +1);
 	expected_uniqueid = ast_strdup(stasis_subscription_uniqueid(uut));
 
-	stasis_unsubscribe(uut);
-	uut = NULL;
+	uut = stasis_unsubscribe(uut);
 	complete = consumer_wait_for_completion(consumer);
 	ast_test_validate(test, 1 == complete);
 
@@ -376,8 +375,7 @@ AST_TEST_DEFINE(unsubscribe_stops_messages)
 	ast_test_validate(test, NULL != uut);
 	ao2_ref(consumer, +1);
 
-	stasis_unsubscribe(uut);
-	uut = NULL;
+	uut = stasis_unsubscribe(uut);
 
 	test_data = ao2_alloc(1, NULL);
 	ast_test_validate(test, NULL != test_data);