init.h: fix spelling typo in comment

Fix spelling typo in comment.

Link: https://lkml.kernel.org/r/20220905021034.947701-1-13667453960@163.com


Signed-off-by: Jiangshan Yi <yijiangshan@kylinos.cn>
Reported-by: k2ci <kernel-bot@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>