Kristof Provost 36dcd97de3 libc: Shortcut if_indextoname() if index == 0
If the index we're trying to convert is 0 we can avoid a potentially
expensive call to getifaddrs(). No interface has an ifindex of zero, so
we can handle this as an error: set the errno to ENXIO and return NULL.

Submitted by:	Nick Rogers
Reviewed by:	lutz at donnerhacke.de
MFC after:	2 weeks
Sponsored by:	RG Nets
Differential Revision:	https://reviews.freebsd.org/D24524
2020-04-23 21:16:51 +00:00
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