Angus Gratton df816f4940 lwip: Fix leak when accept() fails due to max socket limit
As reported https://esp32.com/viewtopic.php?f=14&t=6171

event_callback() in sockets.c calls conn->socket-- to register
activity on a netconn which may not have any socket yet,
so any socket value < 0 indicates "no controlling socket"
for the netconn.
2018-06-21 15:22:48 +10:00
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