tree-wide: fix 'lenght' typo in comments and code

Some misspelled occurences of 'octet' and some comments were also fixed
as I was on it.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Jiri Kosina <trivial@kernel.org>
Cc: Joe Perches <joe@perches.com>
Cc: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/crypto/hifn_795x.c b/drivers/crypto/hifn_795x.c
index 09ad915..73e8b17 100644
--- a/drivers/crypto/hifn_795x.c
+++ b/drivers/crypto/hifn_795x.c
@@ -321,7 +321,7 @@
 #define	HIFN_PUBOPLEN_MOD_M	0x0000007f	/* modulus length mask */
 #define	HIFN_PUBOPLEN_MOD_S	0		/* modulus length shift */
 #define	HIFN_PUBOPLEN_EXP_M	0x0003ff80	/* exponent length mask */
-#define	HIFN_PUBOPLEN_EXP_S	7		/* exponent lenght shift */
+#define	HIFN_PUBOPLEN_EXP_S	7		/* exponent length shift */
 #define	HIFN_PUBOPLEN_RED_M	0x003c0000	/* reducend length mask */
 #define	HIFN_PUBOPLEN_RED_S	18		/* reducend length shift */