[ROSE]: rose_heartbeat_expiry() locking fix

Missing unlock, as noted by Ted Unangst <[e-mail]>.

Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

net/rose/rose_timer.c

···
 		   is accepted() it isn't 'dead' so doesn't get removed. */
 		if (sock_flag(sk, SOCK_DESTROY) ||
 		    (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
+			bh_unlock_sock(sk);
 			rose_destroy_socket(sk);
 			return;
 		}