staging: zsmalloc: zsmalloc: use unsigned long instead of void *

We should use unsigned long as handle instead of void * to avoid any
confusion. Without this, users may just treat zs_malloc return value as
a pointer and try to deference it.

This patch passed compile test(zram, zcache and ramster) and zram is
tested on qemu.

changelog
  * from v2
	- remove hval pointed out by Nitin
	- based on next-20120607
  * from v1
	- change zcache's zv_create return value
	- baesd on next-20120604

Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	drivers/staging/zsmalloc/zsmalloc-main.c
F2FS: Backport to 3.4

Based off of patches here:
nowcomputing/f2fs-backports#1

Change-Id: I2be6d8abf4e3e4c6b9e8d635700930af432fe37a

Conflicts:
	fs/f2fs/acl.c
	fs/f2fs/file.c
	fs/f2fs/gc.c
	fs/f2fs/gc.h
	fs/f2fs/inode.c
	fs/f2fs/namei.c
	fs/f2fs/super.c