net: avoid infinite recursion in Windows Resolver.lookupTXT
For #33097
Change-Id: I6138dc844f0b29b01c78a02efc1e1b1ad719b803
Reviewed-on: https://go-review.googlesource.com/c/go/+/412139 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>