[Xcb] [Bug 72253] Test the value of msg_controllen for platforms whose CMSG_FIRSTHDR() does not test it for us.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72253

--- Comment #1 from Mark Kettenis <kettenis at openbsd.org> ---
POSIX mandates that CMSG_FIRSTHDR() checks, and Darwin 10.0.0 (OS X 10.6) has
this fixed.  Must say I am a bit surprised that older versions don't do the
check.  Anyway, the fix looks right to me.

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