[IPSEC]: Missing unlock in policy timer.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@redhat.com>

net/xfrm/xfrm_policy.c

@@ -204,6 +204,7 @@ static void xfrm_policy_timer(unsigned long data)
 	return;
 
 expired:
+	read_unlock(&xp->lock);
 	km_policy_expired(xp, dir, 1);
 	xfrm_policy_delete(xp, dir);
 	xfrm_pol_put(xp);