staging: vt6656: rxtx.c s_uGetDataDuration return endian corrected u16.

The return always be u16 endian corrected. For the
large part this is missing.

Fix uGetDataDuration to return u16 endian corrected.

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