[Bug 276614] graphics/mesa-dri:fix os_same_file_description warning

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276614

--- Comment #41 from Jan Beich <jbeich@FreeBSD.org> ---
Created attachment 249495
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=249495&action=edit
syslog() every time missing kcmp() can leak memory

(In reply to Yusuf Khan from comment #34)
> (with a minor memory leak?)

The original leaks weren't "minor", see
https://gitlab.freedesktop.org/mesa/mesa/-/issues/1426 and
https://gitlab.freedesktop.org/mesa/mesa/-/issues/2270 . Would be nice to
collect more data by unthrottling the warning (see attached patch) and checking
what triggers it. However, I'm not sure how to catch leaks over long-lived
graphical sessions.

For example, nesting sway/mesa-dri from 13.2 jail under sway-devel/mesa-devel
from 15.0-CURRENT host suggests kcmp() is required at least 3 times (on the
jail side).

# pkg install -qy sway
$ MESA_LOG=file sway
MESA: warning: iris: Kernel has no file descriptor comparison support: Invalid
argument
MESA: warning: iris: Kernel has no file descriptor comparison support: No such
file or directory
MESA: warning: iris: Kernel has no file descriptor comparison support: No such
file or directory
[...]

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