}
change_uid = am_root && preserve_uid && st->st_uid != file->uid;
- change_gid = preserve_gid && file->gid != (gid_t)-1
+ change_gid = preserve_gid && file->gid != GID_NONE
&& st->st_gid != file->gid;
if (change_uid || change_gid) {
if (do_lchown(fname,