kernel: fix typos and some coding style in comments

fix lenght to length

Link: http://lkml.kernel.org/r/20190521050937.4370-1-houweitaoo@gmail.com
Signed-off-by: Weitao Hou <houweitaoo@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

sound/soc/qcom/qdsp6/q6asm.c

@@ -1194,7 +1194,7 @@ EXPORT_SYMBOL_GPL(q6asm_open_read);
  * q6asm_write_async() - non blocking write
  *
  * @ac: audio client pointer
- * @len: lenght in bytes
+ * @len: length in bytes
  * @msw_ts: timestamp msw
  * @lsw_ts: timestamp lsw
  * @wflags: flags associated with write