Brad Fitzpatrick c30fa5903d wgengine/magicsock: remove peerMap.byDiscoKey map
No longer used.

Updates #3088

Change-Id: I0ced3f87baa4053d3838d3c4a828ed0293923825
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-10-19 12:22:11 -07:00
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