FS-11818 [core] fix memory leak when using dial handle in switch_ivr_originate()

src/switch_ivr_originate.c

@@ -2186,6 +2186,9 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_originate(switch_core_session_t *sess
 	if (dh) {
 		switch_event_t *vp = switch_dial_handle_get_global_vars(dh);
 		if (vp) {
+			if (var_event && var_event != ovars) {
+				switch_event_destroy(&var_event);
+			}
 			switch_event_dup(&var_event, vp);
 		}
 	}