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kp
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2020-05-07T21:14:11.628754Z
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MFC r360231:

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
Sponsored by:	RG Nets

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