[PATCH] Test status before h_errno in gaih_inet

[Stan Shebs]

Per feedback on my previous attempt to fix getaddrinfo failures
after recovering from a failure:

https://sourceware.org/ml/libc-alpha/2016-07/msg00341.html

here is a simpler patch that checks status before checking
h_errno.

The patch basically adds back a test that was previously
present.  I am not 100% convinced that it catches all cases
of NSS status being set in a way that ought to be reported
as an error coming from getaddrinfo, but I can't find
any actual examples.

2016-07-25  Stan Shebs  <stanshebs@google.com>

        * sysdeps/posix/getaddrinfo.c (gaih_inet): Test status before
        looking at h_errno.
        * posix/tst-getaddrinfo6.c: New test.
        * posix/Makefile (tests): Add tst-getaddrinfo6.
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