- Eliminate double declaration of variable blob_len
- Modify function build_ntlmssp_auth_blob to return error code
  as well as length of the blob.
Signed-off-by: NShirish Pargaonkar <shirishpargaonkar@gmail.com>
Reviewed-by: NJeff Layton <jlayton@samba.org>
Signed-off-by: NSteve French <sfrench@us.ibm.com>