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net: avoid an infinite loop in LookupAddr
If a request for a PTR record returned a response with a non-PTR answer, goLookupPTR would loop forever. Skipping non-PTR answers guarantees progress through the DNS response. Fixes #34660 Change-Id: I56f9d21e5342d07e7d843d253267e93a29707904 Reviewed-on: https://go-review.googlesource.com/c/go/+/198460 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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