staging: vt6656: Fix return for unsupported cipher modes.

mac80211 expect to see -EOPNOTSUPP on unsupported ciphers so
these can be done on stack.

correct all the returns to do this.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/b65a3b23-735f-f679-0f16-a54c3266b5ae@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/key.c

@@ -144,11 +144,14 @@ int vnt_set_keys(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 		break;
 	case WLAN_CIPHER_SUITE_CCMP:
 		if (priv->local_id <= MAC_REVISION_A1)
-			return -EINVAL;
+			return -EOPNOTSUPP;
 
 		key_dec_mode = KEY_CTL_CCMP;
 
 		key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
+		break;
+	default:
+		return -EOPNOTSUPP;
 	}
 
 	if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE) {

drivers/staging/vt6656/main_usb.c

@@ -858,9 +858,7 @@ static int vnt_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 
 	switch (cmd) {
 	case SET_KEY:
-		if (vnt_set_keys(hw, sta, vif, key))
-			return -EOPNOTSUPP;
-		break;
+		return vnt_set_keys(hw, sta, vif, key);
 	case DISABLE_KEY:
 		if (test_bit(key->hw_key_idx, &priv->key_entry_inuse))
 			clear_bit(key->hw_key_idx, &priv->key_entry_inuse);