Simon Law c4f7ef6323
cmd/derpprobe: exit with non-zero status if --once fails
`cmd/derpprobe --once` didn’t respect the convention of non-zero exit
status for a failed run. It would always exit zero (i.e. success),
even. This patch fixes that, but only for `--once` mode.

Fixes: #15925

Signed-off-by: Simon Law <sfllaw@tailscale.com>
2025-05-08 19:37:24 -07:00
..
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