samba incorrect primary group assignment for domain users using the rfc2307 or sfu winbind nss info plugin

The Winbind nssinfo extension nsswitch/idmapad.c in idmapad.so in Samba 3.0.25 through 3.0.25c, when the "winbind nss info" option is set to rfc2307 or sfu, grants all local users the privileges of gid 0 when the 1 RFC2307 or 2 Services for UNIX SFU primary group attribute is not defined...