nl: Return -NLE_AGAIN if non-blocking socket would block
Previously 0 was returned which gave the caller no chance of detecting when a non-blocking socket would block. If a caller intends to never see an error message it should utilize poll()/select() to only read when the socket has pending data or information. Reported-by: Holger Eitzenberger <holger@eitzenberger.org> Signed-off-by: Thomas Graf <tgraf@suug.ch>
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