treewide: fix a few typos in comments

- kenrel -> kernel
- whetehr -> whether
- ttt -> tt
- sss -> ss

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/include/linux/posix-clock.h b/include/linux/posix-clock.h
index 7f1183dc..34c4498 100644
--- a/include/linux/posix-clock.h
+++ b/include/linux/posix-clock.h
@@ -45,7 +45,7 @@
  * @timer_create:   Create a new timer
  * @timer_delete:   Remove a previously created timer
  * @timer_gettime:  Get remaining time and interval of a timer
- * @timer_setttime: Set a timer's initial expiration and interval
+ * @timer_settime: Set a timer's initial expiration and interval
  * @fasync:         Optional character device fasync method
  * @mmap:           Optional character device mmap method
  * @open:           Optional character device open method