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/wireless/iwlegacy/4965-mac.c b/drivers/net/wireless/iwlegacy/4965-mac.c
index 7941eb3..238f528 100644
--- a/drivers/net/wireless/iwlegacy/4965-mac.c
+++ b/drivers/net/wireless/iwlegacy/4965-mac.c
@@ -1921,8 +1921,8 @@
 static inline int
 il4965_alloc_dma_ptr(struct il_priv *il, struct il_dma_ptr *ptr, size_t size)
 {
-	ptr->addr =
-	    dma_alloc_coherent(&il->pci_dev->dev, size, &ptr->dma, GFP_KERNEL);
+	ptr->addr = dma_alloc_coherent(&il->pci_dev->dev, size, &ptr->dma,
+				       GFP_KERNEL);
 	if (!ptr->addr)
 		return -ENOMEM;
 	ptr->size = size;