kernel: fix typos and some coding style in comments

fix lenght to length

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Weitao Hou <[email protected]>
Acked-by: Kees Cook <[email protected]>
Cc: Colin Ian King <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
4 files changed