scsi: iscsi_tcp: Remove a set-but-not-used variable

This patch avoids that gcc reports the following warning when
building with W=1:

drivers/scsi/iscsi_tcp.c:166:24: warning: variable ?session? set but not used [-Wunused-but-set-variable]
Signed-off-by: NBart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NHannes Reinecke <hare@suse.com>
Cc: Lee Duncan <lduncan@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/iscsi_tcp.c

@@ -163,7 +163,6 @@ static void iscsi_sw_tcp_state_change(struct sock *sk)
 	struct iscsi_tcp_conn *tcp_conn;
 	struct iscsi_sw_tcp_conn *tcp_sw_conn;
 	struct iscsi_conn *conn;
-	struct iscsi_session *session;
 	void (*old_state_change)(struct sock *);
 
 	read_lock_bh(&sk->sk_callback_lock);
@@ -172,7 +171,6 @@ static void iscsi_sw_tcp_state_change(struct sock *sk)
 		read_unlock_bh(&sk->sk_callback_lock);
 		return;
 	}
-	session = conn->session;
 
 	iscsi_sw_sk_state_check(sk);