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/pasemi/pasemi_mac.c b/drivers/net/ethernet/pasemi/pasemi_mac.c
index f21ae7b..c498181 100644
--- a/drivers/net/ethernet/pasemi/pasemi_mac.c
+++ b/drivers/net/ethernet/pasemi/pasemi_mac.c
@@ -440,10 +440,9 @@
 	if (pasemi_dma_alloc_ring(&ring->chan, RX_RING_SIZE))
 		goto out_ring_desc;
 
-	ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
-					   RX_RING_SIZE * sizeof(u64),
-					   &ring->buf_dma,
-					   GFP_KERNEL | __GFP_ZERO);
+	ring->buffers = dma_zalloc_coherent(&mac->dma_pdev->dev,
+					    RX_RING_SIZE * sizeof(u64),
+					    &ring->buf_dma, GFP_KERNEL);
 	if (!ring->buffers)
 		goto out_ring_desc;