res_pjsip_refer: Made refer_attended_alloc() not create the ao2 object with a lock.

The lock is unused.
........

Merged revisions 432574 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@432579 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip_refer.c

@@ -425,11 +425,14 @@ static void refer_attended_destroy(void *obj)
 }
 
 /*! \brief Allocator for attended transfer task */
-static struct refer_attended *refer_attended_alloc(struct ast_sip_session *transferer, struct ast_sip_session *transferer_second,
+static struct refer_attended *refer_attended_alloc(struct ast_sip_session *transferer,
+	struct ast_sip_session *transferer_second,
 	struct refer_progress *progress)
 {
-	struct refer_attended *attended = ao2_alloc(sizeof(*attended), refer_attended_destroy);
+	struct refer_attended *attended;
 
+	attended = ao2_alloc_options(sizeof(*attended), refer_attended_destroy,
+		AO2_ALLOC_OPT_LOCK_NOLOCK);
 	if (!attended) {
 		return NULL;
 	}