[IPSEC]: Remove bogus ref count in xfrm_secpath_reject

Constructs of the form

	xfrm_state_hold(x);
	foo(x);
	xfrm_state_put(x);

tend to be broken because foo is either synchronous where this is totally
unnecessary or if foo is asynchronous then the reference count is in the
wrong spot.

In the case of xfrm_secpath_reject, the function is synchronous and therefore
we should just kill the reference count.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/xfrm/xfrm_policy.c

@@ -1682,17 +1682,13 @@ static inline int
 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
 {
 	struct xfrm_state *x;
-	int err;
 
 	if (!skb->sp || idx < 0 || idx >= skb->sp->len)
 		return 0;
 	x = skb->sp->xvec[idx];
 	if (!x->type->reject)
 		return 0;
-	xfrm_state_hold(x);
-	err = x->type->reject(x, skb, fl);
-	xfrm_state_put(x);
-	return err;
+	return x->type->reject(x, skb, fl);
 }
 
 /* When skb is transformed back to its "native" form, we have to