Brad Fitzpatrick b62cfc430a tstest/integration/testcontrol: fix data race
Noticed in earlier GitHub actions failure.

Fixes #11994

Change-Id: Iba8d753caaa3dacbe2da9171d96c5f99b12e62d7
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2024-05-03 10:03:48 -07:00
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