Manuel Pégourié-Gonnard 9bd0afdb22 Add guards for closed socket in net.c ...

This is particularly problematic when calling FD_SET( -1, ... ), but let's
check it in all functions.

This was introduced with the new API and the fact the net_free() now sets the
internal fd to -1 in order to mark it as closed: now using this information.

2015-07-01 19:03:27 +02:00

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