rdma/siw: Remove set but not used variable 's'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/infiniband/sw/siw/siw_cm.c: In function siw_cm_llp_state_change:
drivers/infiniband/sw/siw/siw_cm.c:1278:17: warning: variable s set but not used [-Wunused-but-set-variable]

Fixes: 6c52fdc2 ("rdma/siw: connection management")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/sw/siw/siw_cm.c

@@ -1275,7 +1275,6 @@ static void siw_cm_llp_error_report(struct sock *sk)
 static void siw_cm_llp_state_change(struct sock *sk)
 {
 	struct siw_cep *cep;
-	struct socket *s;
 	void (*orig_state_change)(struct sock *s);
 
 	read_lock(&sk->sk_callback_lock);
@@ -1288,8 +1287,6 @@ static void siw_cm_llp_state_change(struct sock *sk)
 	}
 	orig_state_change = cep->sk_state_change;
 
-	s = sk->sk_socket;
-
 	siw_dbg_cep(cep, "state: %d\n", cep->state);
 
 	switch (sk->sk_state) {