winbindd: Ensure we do not look at rid_array before checking if it was returned

winbindd: Ensure we do not look at rid_array before checking if it was returned

We no longer return early if there are no members, we just return an empty array.

Fixes bug #10627 - rid_array used before status checked - segmentation fault due to null pointer dereference

https://bugzilla.samba.org/show_bug.cgi?id=10627

Change-Id: I7b0949e0c0b9277426a8007514a8658615f6c709
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
Autobuild-User(v4-0-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-0-test): Wed Jun 11 11:40:38 CEST 2014 on sn-devel-104