bridging: Ensure locking during snapshot creation

While the vast majority of bridge snapshot creation is locked properly,
there are currently some instances that are not. This adds the missing
locking to ensure bridge state is not malleable during snapshot
creation.

(closes issue ASTERISK-22904)
Review: https://reviewboard.asterisk.org/r/3415/
Reported by: Matt Jordan
........

Merged revisions 412193 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@412194 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_confbridge.c

@@ -453,10 +453,13 @@ static void send_conf_stasis(struct confbridge_conference *conference, struct as
 		ast_json_object_update(json_object, extras);
 	}
 
+	ast_bridge_lock(conference->bridge);
 	msg = ast_bridge_blob_create(type,
 		conference->bridge,
 		chan,
 		json_object);
+	ast_bridge_unlock(conference->bridge);
+
 	if (!msg) {
 		return;
 	}