This comment is obsolete, as:
- This code is FreeBSD-specific and is not shared with other BSDs.
- With our recent changes in commit be1f7435ef218b1d ("kern: start tracking cr_gid outside of cr_groups[]"), all of NetBSD, OpenBSD and FreeBSD have the effective GID in a separate field (DragonFlyBSD remains to this day an outlier).
Sponsored by: The FreeBSD Foundation