smack: Fix missing calls to netlbl_skbuff_err()

Smack needs to call netlbl_skbuff_err() to let NetLabel do the necessary
protocol specific error handling.
Signed-off-by: Paul Moore <paul.moore@hp.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>

security/smack/smack_lsm.c

@@ -2179,7 +2179,10 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
 	 * This is the simplist possible security model
 	 * for networking.
 	 */
-	return smk_access(smack, ssp->smk_in, MAY_WRITE);
+	rc = smk_access(smack, ssp->smk_in, MAY_WRITE);
+	if (rc != 0)
+		netlbl_skbuff_err(skb, rc, 0);
+	return rc;
 }
 
 /**