irda: irttp: allow zero byte packets
Sending zero byte packets is not neccessarily an error (AF_INET accepts it, too), so just apply a shortcut. This was discovered because of a non-working software with WINE. See http://bugs.winehq.org/show_bug.cgi?id=19397#c86 http://thread.gmane.org/gmane.linux.irda.general/1643 for very detailed debugging information and a testcase. Kudos to Wolfgang for those! Reported-by:Wolfgang Schwotzer <wolfgang.schwotzer@gmx.net> Signed-off-by:
Wolfram Sang <w.sang@pengutronix.de> Tested-by:
Mike Evans <mike.evans@cardolan.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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