cifs: fix MUST SecurityFlags filtering
cifs: fix MUST SecurityFlags filtering

If CONFIG_CIFS_WEAK_PW_HASH is not set, CIFSSEC_MUST_LANMAN
and CIFSSEC_MUST_PLNTXT is defined as 0.

When setting new SecurityFlags without any MUST flags,
your flags would be overwritten with CIFSSEC_MUST_LANMAN (0).

Signed-off-by: Niklas Cassel <067bfd772d91b96c82a90b4442f3e1cab6088cae@axis.com>
Signed-off-by: Steve French <e960749f639d1acd8d03331895f053a37e692e9c@primarydata.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs