mm/zbud: change zbud_alloc size type to size_t

mm/zbud: change zbud_alloc size type to size_t

Change the type of the zbud_alloc() size param from unsigned int
to size_t.

Technically, this should not make any difference, as the zbud
implementation already restricts the size to well within either
type's limits; but as zsmalloc (and kmalloc) use size_t, and
zpool will use size_t, this brings the size parameter type
in line with zsmalloc/zpool.

Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Acked-by: Seth Jennings <sjennings@variantweb.net>
Cc: Weijie Yang <weijie.yang@samsung.com>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>