Re: git: d3f96f661050 - main - Fix O(n^2) behavior in sysctl

This change has resulted in some external breakage:

> drm_sysctl_freebsd.c:93:2: error: no member named 'sle_next' in 'struct sysctl_oid::(unnamed at /usr/src/sys/sys/sysctl.h:189:2)'
>         SLIST_FOREACH(oid, SYSCTL_CHILDREN(drioid), oid_link) {
>         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> /usr/src/sys/sys/queue.h:236:14: note: expanded from macro 'SLIST_FOREACH'
>             (var) = SLIST_NEXT((var), field))
>                     ^~~~~~~~~~~~~~~~~~~~~~~~
> /usr/src/sys/sys/queue.h:272:46: note: expanded from macro 'SLIST_NEXT'
> #define SLIST_NEXT(elm, field)  ((elm)->field.sle_next)

Maybe we should have a SYSCTL_FOREACH() macro?

--HPS