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/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 74273e6..77623b9 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2128,7 +2128,7 @@
 
 /**
  *	gsmld_detach_gsm	-	stop doing 0710 mux
- *	@tty: tty atttached to the mux
+ *	@tty: tty attached to the mux
  *	@gsm: mux
  *
  *	Shutdown and then clean up the resources used by the line discipline