cifs: clean up an inconsistent indenting

Eliminate the follow smatch warning:
fs/cifs/sess.c:1581 sess_auth_rawntlmssp_authenticate() warn:
inconsistent indenting

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Steve French <stfrench@microsoft.com>