Spelling fixes: lenght->length

Signed-off-by: Paulius Zaleckas <pauliusz@yahoo.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/include/linux/wireless.h b/include/linux/wireless.h
index 74e84ca..3160dfed 100644
--- a/include/linux/wireless.h
+++ b/include/linux/wireless.h
@@ -1079,7 +1079,7 @@
  */
 struct iw_event
 {
-	__u16		len;			/* Real lenght of this stuff */
+	__u16		len;			/* Real length of this stuff */
 	__u16		cmd;			/* Wireless IOCTL */
 	union iwreq_data	u;		/* IOCTL fixed payload */
 };