xen/sched: fix memory leak in credit2

csched2_deinit() is leaking the run-queue memory.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Dario Faggioli <dfaggioli@suse.com>

xen/common/sched_credit2.c

@@ -4070,6 +4070,8 @@ csched2_deinit(struct scheduler *ops)
 
     prv = csched2_priv(ops);
     ops->sched_data = NULL;
+    if ( prv )
+        xfree(prv->rqd);
     xfree(prv);
 }