staging: vt6656: Remove memory buffer from vnt_download_firmware.

The memory buffer is being done twice here as vnt_control_out passes
it straight to kmemdup.

Remove buffer and add const to the variable in vnt_control_out to pass
the pointer to it.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/be025ed0-204d-e957-4bc9-963e841fcb2c@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>