Josh Bleecher Snyder 773af7292b wgengine/magicsock: simplify peerMap.upsertEndpoint
We can do the "maybe delete" check unilaterally:
In the case of an insert, both oldDiscoKey
and ep.discoKey will be the zero value.

And since we don't use pi again, we can skip
giving it a name, which makes scoping clearer.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-11-16 15:15:49 -08:00
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