[PATCH] Fix endless loop in nss_dns getnetbyname [BZ #17630]

[Florian Weimer]

The outer loop never advanced the alias pointer in case of a parse 
error.  I think this patch restores the original intent, but I'm not sure.

Tested on x86_64-redhat-linux-gnu.

I have requested CVE assignment on oss-security.

-- 
Florian Weimer / Red Hat Product Security
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