typo fixes: occuring -> occurring

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/net/wireless/ipw2100.c b/drivers/net/wireless/ipw2100.c
index 94aeb23..f502553 100644
--- a/drivers/net/wireless/ipw2100.c
+++ b/drivers/net/wireless/ipw2100.c
@@ -5358,7 +5358,7 @@
 		     idx, keylen, len);
 
 	/* NOTE: We don't check cached values in case the firmware was reset
-	 * or some other problem is occuring.  If the user is setting the key,
+	 * or some other problem is occurring.  If the user is setting the key,
 	 * then we push the change */
 
 	wep_key->idx = idx;