MT#55447 add payload_type_destroy

Helper function for auto cleanup handlers.

Change-Id: Icce9f91d696a22bae5490b4df9ce1d71c51579e9

daemon/codec.c

@@ -3999,6 +3999,11 @@ void payload_type_free(struct rtp_payload_type *p) {
 	payload_type_clear(p);
 	g_slice_free1(sizeof(*p), p);
 }
+void payload_type_destroy(struct rtp_payload_type **p) {
+	if (*p)
+		payload_type_free(*p);
+	*p = NULL;
+}
 
 
 // dst must be pre-initialised (zeroed)

include/codec.h

@@ -116,6 +116,7 @@ struct codec_packet *codec_packet_dup(struct codec_packet *p);
 bool codec_packet_copy(struct codec_packet *p);
 
 void payload_type_free(struct rtp_payload_type *p);
+void payload_type_destroy(struct rtp_payload_type **p);
 struct rtp_payload_type *rtp_payload_type_dup(const struct rtp_payload_type *pt);
 
 // special return value `(void *) 0x1` to signal type mismatch