mqueuefs: Do not allow manipulation of the pseudo-dirents "." and ".."
"." and ".." names are not maintained in the mqueuefs dirent datastructure and
cannot be opened as mqueues. Creating or removing them is invalid; return
EINVAL instead of crashing.
PR: 236836
Submitted by: Torbjørn Birch Moltu <t.b.moltu AT lyse.net>
Discussed with: jilles (earlier version)
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head/sys/kern/uipc_mqueue.c