virtio_balloon-introduce-migration-primitives-to-balloon-pages-fix-fix-fix

virtio_balloon-introduce-migration-primitives-to-balloon-pages-fix-fix-fix

drivers/virtio/virtio_balloon.c: In function 'fill_balloon':
drivers/virtio/virtio_balloon.c:142:4: warning: format '%zu' expects argument of type 'size_t', but argument 3 has type 'long unsigned int' [-Wformat]

The type of PAGE_SIZE is different on different architectures (or at
least, it used to be).  Make things predictable.

Cc: Rafael Aquini <aquini@redhat.com>
Cc: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>