[XFRM]: Eliminate refcounting confusion by creating __xfrm_state_put().

We often just do an atomic_dec(&x->refcnt) on an xfrm_state object
because we know there is more than 1 reference remaining and thus
we can elide the heavier xfrm_state_put() call.

Do this behind an inline function called __xfrm_state_put() so that is
more obvious and also to allow us to more cleanly add refcount
debugging later.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index e12d0be..c656cba 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -220,14 +220,14 @@
 		x->km.state = XFRM_STATE_DEAD;
 		spin_lock(&xfrm_state_lock);
 		list_del(&x->bydst);
-		atomic_dec(&x->refcnt);
+		__xfrm_state_put(x);
 		if (x->id.spi) {
 			list_del(&x->byspi);
-			atomic_dec(&x->refcnt);
+			__xfrm_state_put(x);
 		}
 		spin_unlock(&xfrm_state_lock);
 		if (del_timer(&x->timer))
-			atomic_dec(&x->refcnt);
+			__xfrm_state_put(x);
 
 		/* The number two in this test is the reference
 		 * mentioned in the comment below plus the reference
@@ -243,7 +243,7 @@
 		 * The xfrm_state_alloc call gives a reference, and that
 		 * is what we are dropping here.
 		 */
-		atomic_dec(&x->refcnt);
+		__xfrm_state_put(x);
 		err = 0;
 	}