Staging: w35und: Kill struct hwdata ->NullPacketCount

This patch kills the NullPacketCount member of struct hwdata. It's not used for
anything so it's safe to remove it.

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>