drivers:net: Convert dma_alloc_coherent(...__GFP_ZERO) to dma_zalloc_coherent

__GFP_ZERO is an uncommon flag and perhaps is better
not used.  static inline dma_zalloc_coherent exists
so convert the uses of dma_alloc_coherent with __GFP_ZERO
to the more common kernel style with zalloc.

Remove memset from the static inline dma_zalloc_coherent
and add just one use of __GFP_ZERO instead.

Trivially reduces the size of the existing uses of
dma_zalloc_coherent.

Realign arguments as appropriate.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/tundra/tsi108_eth.c b/drivers/net/ethernet/tundra/tsi108_eth.c
index 01bdc6c..f2e76c9 100644
--- a/drivers/net/ethernet/tundra/tsi108_eth.c
+++ b/drivers/net/ethernet/tundra/tsi108_eth.c
@@ -1308,13 +1308,13 @@
 		       data->id, dev->irq, dev->name);
 	}
 
-	data->rxring = dma_alloc_coherent(NULL, rxring_size, &data->rxdma,
-					  GFP_KERNEL | __GFP_ZERO);
+	data->rxring = dma_zalloc_coherent(NULL, rxring_size, &data->rxdma,
+					   GFP_KERNEL);
 	if (!data->rxring)
 		return -ENOMEM;
 
-	data->txring = dma_alloc_coherent(NULL, txring_size, &data->txdma,
-					  GFP_KERNEL | __GFP_ZERO);
+	data->txring = dma_zalloc_coherent(NULL, txring_size, &data->txdma,
+					   GFP_KERNEL);
 	if (!data->txring) {
 		pci_free_consistent(0, rxring_size, data->rxring, data->rxdma);
 		return -ENOMEM;