[PATCH] USB: net2280: send 0-length packets for ep0

This patch (as669) fixes a bug in the net2280 driver.  Now it will
properly send zero-length packets on ep0 until the control status stage
occurs.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>