xfrm: spin_lock() should be spin_unlock() in xfrm_state.c

spin_lock() should be spin_unlock() in xfrm_state_walk_done().

caused by:
commit 12a169e7d8
"ipsec: Put dumpers on the dump list"

Reported-by: Marc Milgram <mmilgram@redhat.com>
Signed-off-by: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/xfrm/xfrm_state.c

@@ -1615,7 +1615,7 @@ void xfrm_state_walk_done(struct xfrm_state_walk *walk)
 
 	spin_lock_bh(&xfrm_state_lock);
 	list_del(&walk->all);
-	spin_lock_bh(&xfrm_state_lock);
+	spin_unlock_bh(&xfrm_state_lock);
 }
 EXPORT_SYMBOL(xfrm_state_walk_done);