fix comment typos concerning "challenge"

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/net/wireless/hostap/hostap_ap.c b/drivers/net/wireless/hostap/hostap_ap.c
index 231dbd7..cb3c25f 100644
--- a/drivers/net/wireless/hostap/hostap_ap.c
+++ b/drivers/net/wireless/hostap/hostap_ap.c
@@ -1225,7 +1225,7 @@
 
 
 /* Generate challenge data for shared key authentication. IEEE 802.11 specifies
- * that WEP algorithm is used for generating challange. This should be unique,
+ * that WEP algorithm is used for generating challenge. This should be unique,
  * but otherwise there is not really need for randomness etc. Initialize WEP
  * with pseudo random key and then use increasing IV to get unique challenge
  * streams.