Spelling fixes: lenght->length

Signed-off-by: Paulius Zaleckas <pauliusz@yahoo.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/drivers/ide/ide-timing.h b/drivers/ide/ide-timing.h
index adeda76..3b12ffe 100644
--- a/drivers/ide/ide-timing.h
+++ b/drivers/ide/ide-timing.h
@@ -199,7 +199,7 @@
 	}
 
 /*
- * Lenghten active & recovery time so that cycle time is correct.
+ * Lengthen active & recovery time so that cycle time is correct.
  */
 
 	if (t->act8b + t->rec8b < t->cyc8b) {