RDMA/vmw_pvrdma: Use zeroing memory allocator than allocator/memset

Use dma_zalloc_coherent for allocating zeroed
memory and remove unnecessary memset function.

Done using Coccinelle.
Generated-by: scripts/coccinelle/api/alloc/kzalloc-simple.cocci
0-day tested with no failures.
Suggested-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/vmw_pvrdma/pvrdma_main.c

@@ -882,7 +882,7 @@ static int pvrdma_pci_probe(struct pci_dev *pdev,
 	dev_info(&pdev->dev, "device version %d, driver version %d\n",
 		 dev->dsr_version, PVRDMA_VERSION);
 
-	dev->dsr = dma_alloc_coherent(&pdev->dev, sizeof(*dev->dsr),
+	dev->dsr = dma_zalloc_coherent(&pdev->dev, sizeof(*dev->dsr),
 				       &dev->dsrbase, GFP_KERNEL);
 	if (!dev->dsr) {
 		dev_err(&pdev->dev, "failed to allocate shared region\n");
@@ -891,7 +891,6 @@ static int pvrdma_pci_probe(struct pci_dev *pdev,
 	}
 
 	/* Setup the shared region */
-	memset(dev->dsr, 0, sizeof(*dev->dsr));
 	dev->dsr->driver_version = PVRDMA_VERSION;
 	dev->dsr->gos_info.gos_bits = sizeof(void *) == 4 ?
 		PVRDMA_GOS_BITS_32 :