wireless: fix '!x & y' typo's

Fix priority mistakes similar to '!x & y'

Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index 074055e..e3eca6d 100644
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -6407,7 +6407,7 @@
 			set_wep_key(local, index, NULL, 0, perm, 1);
 		} else
 			/* Don't complain if only change the mode */
-			if(!dwrq->flags & IW_ENCODE_MODE) {
+			if(!(dwrq->flags & IW_ENCODE_MODE)) {
 				return -EINVAL;
 			}
 	}