staging: winbond/mto.c: remove unused variables

They are unused since commit a22517fe:

    Staging: w35und: remove dead code from mto.c

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Acked-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>