Fixes gcc '-Wunused-but-set-variable' warning:
fs/cifs/sess.c: In function '_sess_auth_rawntlmssp_assemble_req':
fs/cifs/sess.c:1157:18: warning:
 variable 'smb_buf' set but not used [-Wunused-but-set-variable]
It never used since commit 
cc87c47d9d7a ("cifs: Separate rawntlmssp auth
from CIFS_SessSetup()")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
 static int
 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
 {
-       struct smb_hdr *smb_buf;
        SESSION_SETUP_ANDX *pSMB;
        struct cifs_ses *ses = sess_data->ses;
        __u32 capabilities;
        char *bcc_ptr;
 
        pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
-       smb_buf = (struct smb_hdr *)pSMB;
 
        capabilities = cifs_ssetup_hdr(ses, pSMB);
        if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {