cfg80211: Clear encryption privacy when key off is done.

When the current_bss is not set, 'iwconfig <iface> key off' does not
clear the private flag. Hence after we connect with WEP to an AP and
then try to connect with another non-WEP AP, it does not work.
This issue will not be seen if supplicant is used.
Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/wext-compat.c

@@ -479,6 +479,7 @@ static int __cfg80211_set_encryption(struct cfg80211_registered_device *rdev,
 			}
 			err = rdev->ops->del_key(&rdev->wiphy, dev, idx, addr);
 		}
+		wdev->wext.connect.privacy = false;
 		/*
 		 * Applications using wireless extensions expect to be
 		 * able to delete keys that don't exist, so allow that.