staging: vt6656: rxtx.c s_vFillRTSHead remove dead bDiscCRC

As result of patch
vt6656: device.h Remove dead code bSoftwareGenCrcErr.

dDiscCRC is unused.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>