We made changes to ipnext callback registration/unregistration/invocation in #15780 that made resetting b.exthost to a nil, no-op host in (*LocalBackend).Shutdown() unnecessary. But resetting it is also racy: b.exthost must be safe for concurrent use with or without b.mu held, so it shouldn't be written after NewLocalBackend returns. This PR removes it. Fixes #17279 Signed-off-by: Nick Khyl <nickk@tailscale.com>main
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