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/fs/squashfs/cache.c b/fs/squashfs/cache.c
index c37b520..4b5a3fb 100644
--- a/fs/squashfs/cache.c
+++ b/fs/squashfs/cache.c
@@ -29,7 +29,7 @@
  * plus functions layered ontop of the generic cache implementation to
  * access the metadata and fragment caches.
  *
- * To avoid out of memory and fragmentation isssues with vmalloc the cache
+ * To avoid out of memory and fragmentation issues with vmalloc the cache
  * uses sequences of kmalloced PAGE_CACHE_SIZE buffers.
  *
  * It should be noted that the cache is not used for file datablocks, these