fix crash due to missing weak_unref.

src/belle_sip_internal.h

@@ -623,6 +623,7 @@ struct belle_http_request{
 };
 
 void belle_http_request_set_listener(belle_http_request_t *req, belle_http_request_listener_t *l);
+void belle_http_request_set_channel(belle_http_request_t *req, belle_sip_channel_t *chan);
 void belle_http_request_set_response(belle_http_request_t *req, belle_http_response_t *resp);
 /*
  belle_sip_transaction_t

src/http-message.c

@@ -32,6 +32,7 @@ static void belle_http_request_destroy(belle_http_request_t *req){
 	if (req->req_uri) belle_sip_object_unref(req->req_uri);
 	DESTROY_STRING(req,method)
 	belle_http_request_set_listener(req,NULL);
+	belle_http_request_set_channel(req,NULL);
 	SET_OBJECT_PROPERTY(req,orig_uri,NULL);
 	SET_OBJECT_PROPERTY(req,response,NULL);
 }
@@ -94,6 +95,21 @@ void belle_http_request_set_listener(belle_http_request_t *req, belle_http_reque
 	}
 }
 
+static void notify_http_request_of_channel_destruction(belle_http_request_t *obj, belle_sip_channel_t *chan_being_destroyed){
+	obj->channel=NULL;
+}
+
+void belle_http_request_set_channel(belle_http_request_t *req, belle_sip_channel_t* chan){
+	if (req->channel){
+		belle_sip_object_weak_unref(req->channel, (belle_sip_object_destroy_notify_t)notify_http_request_of_channel_destruction, req);
+		req->channel=NULL;
+	}
+	if (chan){
+		belle_sip_object_weak_ref(chan, (belle_sip_object_destroy_notify_t)notify_http_request_of_channel_destruction, req);
+		req->channel=chan;
+	}
+}
+
 belle_http_request_listener_t * belle_http_request_get_listener(const belle_http_request_t *req){
 	return req->listener;
 }

src/http-provider.c

@@ -382,10 +382,6 @@ static void belle_http_end_background_task(void* data) {
 	}
 }
 
-static void notify_http_request_of_channel_destruction(belle_http_request_t *obj, belle_sip_channel_t *chan_being_destroyed){
-	obj->channel=NULL;
-}
-
 int belle_http_provider_send_request(belle_http_provider_t *obj, belle_http_request_t *req, belle_http_request_listener_t *listener){
 	belle_sip_channel_t *chan;
 	belle_sip_hop_t *hop=belle_sip_hop_new_from_generic_uri(req->orig_uri ? req->orig_uri : req->req_uri);
@@ -416,8 +412,7 @@ int belle_http_provider_send_request(belle_http_provider_t *obj, belle_http_requ
 	split_request_url(req);
 	fix_request(req);
 
-	belle_sip_object_weak_ref(chan, (belle_sip_object_destroy_notify_t)notify_http_request_of_channel_destruction, req);
-	req->channel=chan;
+	belle_http_request_set_channel(req,chan);
 	if( req->background_task_id != 0){
 		req->background_task_id = belle_sip_begin_background_task("belle-sip http", belle_http_end_background_task, req);
 	}