[Bug 278546] fdevname_r: pass partially uninitialized memory to kernel

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278546

--- Comment #3 from Paul Floyd <pjfloyd@wanadoo.fr> ---
ioctls are one of the things that Valgrind on FreeBSD needs to improve.
Currently there is minimal checking beyond the basic read/write encoding. It
needs to be extended ideally for each kind of descriptor and for each
corresponding data structur and field that gets read from or written to.

Linux does a much better job in this case.

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