Staging: rtl8192e: Use skb_tail_pointer

rtl8192e uses skb->tail directly. This patch uses the tail pointer macros
instead.
Signed-off-by: NJeff Mahoney <jeffm@suse.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rtl8192e/r8192E_core.c

@@ -1807,7 +1807,7 @@ static short rtl8192_alloc_rx_desc_ring(struct net_device *dev)
             return 0;
         priv->rx_buf[i] = skb;
         mapping = (dma_addr_t *)skb->cb;
-        *mapping = pci_map_single(priv->pdev, skb->tail,//skb_tail_pointer(skb),
+        *mapping = pci_map_single(priv->pdev, skb_tail_pointer(skb),
                 priv->rxbuffersize, PCI_DMA_FROMDEVICE);
 
         entry->BufferAddress = cpu_to_le32(*mapping);
@@ -6287,8 +6287,7 @@ static void rtl8192_rx(struct net_device *dev)
 
                 skb = new_skb;
                 priv->rx_buf[priv->rx_idx] = skb;
-                *((dma_addr_t *) skb->cb) = pci_map_single(priv->pdev, skb->tail, priv->rxbuffersize, PCI_DMA_FROMDEVICE);
-//                *((dma_addr_t *) skb->cb) = pci_map_single(priv->pdev, skb_tail_pointer(skb), priv->rxbuffersize, PCI_DMA_FROMDEVICE);
+                *((dma_addr_t *) skb->cb) = pci_map_single(priv->pdev, skb_tail_pointer(skb), priv->rxbuffersize, PCI_DMA_FROMDEVICE);
             }
 
         }

drivers/staging/rtl8192e/r819xE_cmdpkt.c

@@ -135,7 +135,7 @@ RT_STATUS cmpk_message_handle_tx(
              * Transform from little endian to big endian
              * and pending  zero
              */
-            seg_ptr = skb->tail;
+            seg_ptr = skb_tail_pointer(skb);
             for(i=0 ; i < frag_length; i+=4) {
                 *seg_ptr++ = ((i+0)<frag_length)?code_virtual_address[i+3]:0;
                 *seg_ptr++ = ((i+1)<frag_length)?code_virtual_address[i+2]:0;