vxge: use swap() in vxge_hw_channel_dtr_alloc()

Use kernel.h macro definition.

Thanks to Julia Lawall for Coccinelle scripting support.

Signed-off-by: Fabian Frederick <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/neterion/vxge/vxge-traffic.c

···
 static enum vxge_hw_status
 vxge_hw_channel_dtr_alloc(struct __vxge_hw_channel *channel, void **dtrh)
 {
-	void **tmp_arr;
-
 	if (channel->reserve_ptr - channel->reserve_top > 0) {
 _alloc_after_swap:
 		*dtrh =	channel->reserve_arr[--channel->reserve_ptr];
···
 	 * i.e.	no additional lock need	to be done when	we free	a resource */
 
 	if (channel->length - channel->free_ptr > 0) {
-
-		tmp_arr	= channel->reserve_arr;
-		channel->reserve_arr = channel->free_arr;
-		channel->free_arr = tmp_arr;
+		swap(channel->reserve_arr, channel->free_arr);
 		channel->reserve_ptr = channel->length;
 		channel->reserve_top = channel->free_ptr;
 		channel->free_ptr = channel->length;