Set the current transaction to NULL when adding FD to reactor for asy…

…nc jump

(cherry picked from commit eeff37f)

modules/tm/async.c

@@ -212,6 +212,9 @@ int t_handle_async(struct sip_msg *msg, struct action* a , int resume_route)
 	ctx->t = t;
 	ctx->kr = get_kr();
 
+	current_processing_ctx = NULL;
+	set_t(NULL);
+
 	/* place the FD + resume function (as param) into reactor */
 	if (reactor_add_reader( fd, F_SCRIPT_ASYNC, RCT_PRIO_ASYNC, (void*)ctx)<0 ) {
 		LM_ERR("failed to add async FD to reactor -> act in sync mode\n");
@@ -220,7 +223,6 @@ int t_handle_async(struct sip_msg *msg, struct action* a , int resume_route)
 	}
 
 	/* done, break the script */
-	current_processing_ctx = NULL;
 	return 0;
 
 sync: