MT#55283 use g_auto for mix_buffer_ssrc_source

Change-Id: I7dde1b36e7d9aeb4c82f1fdb5c83ec9fe3c2d3da

lib/mix_buffer.c

@@ -139,11 +139,12 @@ void mix_buffer_read_slow(struct mix_buffer *mb, void *outbuf, unsigned int samp
 }
 
 
-static void mix_ssrc_put(mix_buffer_ssrc_source **s) {
-	if (*s)
-		obj_put(&(*s)->h);
+static void mix_ssrc_put(mix_buffer_ssrc_source *s) {
+	obj_put(&s->h);
 }
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(mix_buffer_ssrc_source, mix_ssrc_put)
+
 
 // write at the write-head, direct copy without mixing
 // must be locked already
@@ -269,8 +270,7 @@ bool mix_buffer_write_delay(struct mix_buffer *mb, uint32_t ssrc, const void *bu
 	LOCK(&mb->lock);
 
 	bool created;
-	AUTO_CLEANUP(mix_buffer_ssrc_source *src, mix_ssrc_put)
-		= get_ssrc_full(ssrc, mb->ssrc_hash, &created);
+	g_autoptr(mix_buffer_ssrc_source) src = get_ssrc_full(ssrc, mb->ssrc_hash, &created);
 	if (!src)
 		return false;
 	if (created)