cifs: remove set but not used variable 'server'

fs/cifs/smb2pdu.c: In function 'SMB2_query_directory':
fs/cifs/smb2pdu.c:4444:26: warning:
 variable 'server' set but not used [-Wunused-but-set-variable]
  struct TCP_Server_Info *server;

It is not used, so remove it.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/smb2pdu.c

@@ -4441,13 +4441,10 @@ SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
 	int resp_buftype = CIFS_NO_BUFFER;
 	struct kvec rsp_iov;
 	int rc = 0;
-	struct TCP_Server_Info *server;
 	struct cifs_ses *ses = tcon->ses;
 	int flags = 0;
 
-	if (ses && (ses->server))
-		server = ses->server;
-	else
+	if (!ses || !(ses->server))
 		return -EIO;
 
 	if (smb3_encryption_required(tcon))