IB/mthca: Replace pci_pool_alloc by pci_pool_zalloc

In mthca_create_ah(), pci_pool_alloc() followed by memset will be
replaced by pci_pool_zalloc()
Signed-off-by: Souptick joarder <jrdr.linux@gmail.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mthca/mthca_av.c

@@ -186,8 +186,8 @@ int mthca_create_ah(struct mthca_dev *dev,
 
 on_hca_fail:
 	if (ah->type == MTHCA_AH_PCI_POOL) {
-		ah->av = pci_pool_alloc(dev->av_table.pool,
-					GFP_ATOMIC, &ah->avdma);
+		ah->av = pci_pool_zalloc(dev->av_table.pool,
+					 GFP_ATOMIC, &ah->avdma);
 		if (!ah->av)
 			return -ENOMEM;
 
@@ -196,8 +196,6 @@ int mthca_create_ah(struct mthca_dev *dev,
 
 	ah->key = pd->ntmr.ibmr.lkey;
 
-	memset(av, 0, MTHCA_AV_SIZE);
-
 	av->port_pd = cpu_to_be32(pd->pd_num | (ah_attr->port_num << 24));
 	av->g_slid  = ah_attr->src_path_bits;
 	av->dlid    = cpu_to_be16(ah_attr->dlid);