staging: vchi: Get rid of effect less expression

It was probably there to trick compilers into ignoring unused variables,
which isn't needed in Linux.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/20200629150945.10720-22-nsaenzjulienne@suse.de


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