fix double unref of channel resolver, clean code that set an object name to...

fix double unref of channel resolver, clean code that set an object name to the resolver since it is now done internally.

src/channel.c

@@ -120,7 +120,6 @@ static void belle_sip_channel_destroy(belle_sip_channel_t *obj){
 
 	if (obj->resolver_ctx != NULL) {
 		belle_sip_resolver_context_cancel(obj->resolver_ctx);
-		belle_sip_object_unref(obj->resolver_ctx);
 	}
 	if (obj->inactivity_timer){
 		belle_sip_main_loop_remove_source(obj->stack->ml,obj->inactivity_timer);
@@ -1418,9 +1417,6 @@ void belle_sip_channel_resolve(belle_sip_channel_t *obj){
 	else
 		obj->resolver_ctx=belle_sip_stack_resolve_a(obj->stack, obj->peer_name, obj->peer_port, obj->ai_family, channel_res_done, obj);
 	if (obj->resolver_ctx){
-		char *name = belle_sip_strdup_printf("Channel resolver for %s", obj->peer_name);
-		belle_sip_object_set_name((belle_sip_object_t*)obj->resolver_ctx, name);
-		belle_sip_free(name);
 		belle_sip_object_ref(obj->resolver_ctx);
 	}
 	return ;