Enji Cooper 4ce7bd2527 Fix reporting errors with gai_strerror(..)
The return value (`err`) should be checked; not the `errno` value.

PR:		235200
Approved by:	emaste (mentor)
Reviewed by:	asomers, lwhsu
MFC after:	28 days
MFC with:	r343362, r343365, r343367-r343368
Differential Revision: https://reviews.freebsd.org/D18969
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