MT#55283 obsolete buffer_lock

This should be protected by the master_lock already.

Change-Id: I5369546803c2b5ca9cb821ac7f8d3e7246d6af87

daemon/call.c

@@ -4103,7 +4103,6 @@ static void __call_free(void *p) {
 	}
 
 	call_buffer_free(&c->buffer);
-	mutex_destroy(&c->buffer_lock);
 	rwlock_destroy(&c->master_lock);
 
 	assert(c->stream_fds.head == NULL);
@@ -4114,7 +4113,6 @@ static call_t *call_create(const str *callid) {
 
 	ilog(LOG_NOTICE, "Creating new call");
 	c = obj_alloc0("call", sizeof(*c), __call_free);
-	mutex_init(&c->buffer_lock);
 	call_buffer_init(&c->buffer);
 	rwlock_init(&c->master_lock);
 	c->tags = tags_ht_new();

include/call.h

@@ -712,7 +712,6 @@ struct call {
 	 */
 	struct obj		obj;
 
-	mutex_t			buffer_lock;
 	call_buffer_t		buffer;
 
 	// use a single poller for all sockets within the call
@@ -862,9 +861,7 @@ const rtp_payload_type *__rtp_stats_codec(struct call_media *m);
 
 INLINE void *call_malloc(size_t l) {
 	void *ret;
-	mutex_lock(&call_memory_arena->buffer_lock);
 	ret = call_buffer_alloc(&call_memory_arena->buffer, l);
-	mutex_unlock(&call_memory_arena->buffer_lock);
 	return ret;
 }