staging/comedi/icp_multi: fix sparse warning "obsolete struct initializer"

This patch fixes the sparse warnings
"obsolete struct initializer, use C99 syntax" in icp_multi.c
by converting the struct to C99 syntax

KernelVersion: linux-next-20110110

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>