xfrm: Delete hold_timer when destroy policy

Both policy timer and hold_timer need to be deleted when destroy policy
Signed-off-by: NFan Du <fan.du@windriver.com>
Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com>

net/xfrm/xfrm_policy.c

@@ -308,7 +308,7 @@ void xfrm_policy_destroy(struct xfrm_policy *policy)
 {
 	BUG_ON(!policy->walk.dead);
 
-	if (del_timer(&policy->timer))
+	if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
 		BUG();
 
 	security_xfrm_policy_free(policy->security);