drivers:net: dma_alloc_coherent: use __GFP_ZERO instead of memset(, 0)

Reduce the number of calls required to alloc
a zeroed block of memory.

Trivially reduces overall object size.

Other changes around these removals
o Neaten call argument alignment
o Remove an unnecessary OOM message after dma_alloc_coherent failure
o Remove unnecessary gfp_t stack variable

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/brocade/bna/bnad.c b/drivers/net/ethernet/brocade/bna/bnad.c
index 7cce42d..d588f84 100644
--- a/drivers/net/ethernet/brocade/bna/bnad.c
+++ b/drivers/net/ethernet/brocade/bna/bnad.c
@@ -1264,9 +1264,8 @@
 			mem_info->mdl[i].len = mem_info->len;
 			mem_info->mdl[i].kva =
 				dma_alloc_coherent(&bnad->pcidev->dev,
-						mem_info->len, &dma_pa,
-						GFP_KERNEL);
-
+						   mem_info->len, &dma_pa,
+						   GFP_KERNEL);
 			if (mem_info->mdl[i].kva == NULL)
 				goto err_return;