[PATCH] orinoco: fix setting transmit key only

When determining whether there's a key to set or not, orinoco should be
looking at the key length, not the key data.  Otherwise confusion reigns
when trying to set TX key only, passing in zero-length key, but non-NULL
pointer.  Key length takes precedence over non-NULL key data.
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/orinoco.c

@@ -2875,7 +2875,7 @@ static int orinoco_ioctl_setiwencode(struct net_device *dev,
 	if (orinoco_lock(priv, &flags) != 0)
 		return -EBUSY;
 
-	if (erq->pointer) {
+	if (erq->length > 0) {
 		if ((index < 0) || (index >= ORINOCO_MAX_KEYS))
 			index = priv->tx_key;
 
@@ -2918,7 +2918,7 @@ static int orinoco_ioctl_setiwencode(struct net_device *dev,
 	if (erq->flags & IW_ENCODE_RESTRICTED)
 		restricted = 1;
 
-	if (erq->pointer) {
+	if (erq->pointer && erq->length > 0) {
 		priv->keys[index].len = cpu_to_le16(xlen);
 		memset(priv->keys[index].data, 0,
 		       sizeof(priv->keys[index].data));