fix cpumask build breakage on parisc

Commit 2d3854a3 ("cpumask: introduce new
API, without changing anything") introduced a build breakage on parisc.

This trivial patch fixes it.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kyle Mc Martin <kyle@hera.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>