cfg80211: remove redundant zero check on variable 'changed'

The zero check on variable changed is redundant as it must be
between 1 and 3 at the end of the proceeding if statement block.
Remove the redundant check.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/wext-compat.c

@@ -353,9 +353,6 @@ static int cfg80211_wext_siwretry(struct net_device *dev,
 		changed |= WIPHY_PARAM_RETRY_SHORT;
 	}
 
-	if (!changed)
-		return 0;
-
 	err = rdev_set_wiphy_params(rdev, changed);
 	if (err) {
 		wdev->wiphy->retry_short = oshort;