[PATCH] nss_dns: Skip over non-PTR records in the netent code [BZ #19868]

[Florian Weimer]

The DNS packet parser was broken and got de-synchronized by CNAME or
RRSIG records.  CNAME records are the larger problem because they come
before the PTR records we are interested in.

Curiously, this meant that the RDATA length check was not actually
missing (it was implied by the loop condition).

Florian
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