mm: remove the leftovers of noswapaccount

In commit a2c8990aed ("memsw: remove noswapaccount kernel parameter"),
Michal forgot to remove some left pieces of noswapaccount in the tree,
this patch removes them all.

Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/page_cgroup.c

@@ -537,7 +537,7 @@ int swap_cgroup_swapon(int type, unsigned long max_pages)
 nomem:
 	printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n");
 	printk(KERN_INFO
-		"swap_cgroup can be disabled by noswapaccount boot option\n");
+		"swap_cgroup can be disabled by swapaccount=0 boot option\n");
 	return -ENOMEM;
 }