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/scsi/qla4xxx/ql4_mbx.c b/drivers/scsi/qla4xxx/ql4_mbx.c
index f9d81c8..d78b58d 100644
--- a/drivers/scsi/qla4xxx/ql4_mbx.c
+++ b/drivers/scsi/qla4xxx/ql4_mbx.c
@@ -19,7 +19,7 @@
  * @mbx_cmd: data pointer for mailbox in registers.
  * @mbx_sts: data pointer for mailbox out registers.
  *
- * This routine isssue mailbox commands and waits for completion.
+ * This routine issue mailbox commands and waits for completion.
  * If outCount is 0, this routine completes successfully WITHOUT waiting
  * for the mailbox command to complete.
  **/