staging: rtl8192u: add intermediate variable

This use for more readability.
It also fixes checkpatch.pl warning:
WARNING: line over 80 characters
Signed-off-by: Roxana Blaj <roxanagabriela10@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/r819xU_firmware.c

@@ -45,6 +45,7 @@ static bool fw_download_code(struct net_device *dev, u8 *code_virtual_address,
 	unsigned char	    *seg_ptr;
 	cb_desc		    *tcb_desc;
 	u8                  bLastIniPkt;
+	u8		    index;
 
 	firmware_init_param(dev);
 	//Fragmentation might be required
@@ -87,9 +88,10 @@ static bool fw_download_code(struct net_device *dev, u8 *code_virtual_address,
 		tcb_desc->txbuf_size = (u16)i;
 		skb_put(skb, i);
 
-		if (!priv->ieee80211->check_nic_enough_desc(dev,tcb_desc->queue_index) ||
-			(!skb_queue_empty(&priv->ieee80211->skb_waitQ[tcb_desc->queue_index])) ||
-			(priv->ieee80211->queue_stop)) {
+		index = tcb_desc->queue_index;
+		if (!priv->ieee80211->check_nic_enough_desc(dev, index) ||
+		       (!skb_queue_empty(&priv->ieee80211->skb_waitQ[index])) ||
+		       (priv->ieee80211->queue_stop)) {
 			RT_TRACE(COMP_FIRMWARE,"=====================================================> tx full!\n");
 			skb_queue_tail(&priv->ieee80211->skb_waitQ[tcb_desc->queue_index], skb);
 		} else {