staging: most: hdm-usb: remove unnecessary status assignment

The USB completion callbacks set the status field of an MBO object before
scheduling the clear_work. This patch removes this redundant assignment as
the work_struct does the same for all MBOs.

Signed-off-by: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>