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[unix(4) cleanup 8/8] Fix a double connect race.
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Authored by markj on Sep 2 2020, 5:01 PM.
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Summary

dgram sockets may be connected multiple times. If connect() is called
on a connected dgram socket, soconnectat() calls sodisconnect() before
creating the new connection. However, this is not synchronized, so two
concurrent connect() calls can race with each other, and uipc_connect()
does not handle it. Add an explicit check for unp_conn != NULL in
unp_connectat().

Reported by: syzkaller

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Buildable 33333
Build 30644: arc lint + arc unit