cifs: Check for equality with ACL_TYPE_ACCESS and ACL_TYPE_DEFAULT

The two values ACL_TYPE_ACCESS and ACL_TYPE_DEFAULT are meant to be
enumerations, not bits in a bit mask.  Use '==' instead of '&' to check
for these values.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>