mm: fix some typos in mm/zsmalloc.c

Delete extra semicolon, and fix some typos.

Link: http://lkml.kernel.org/r/586F1823.4050107@huawei.com


Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>