[media] ddbridge: Replace vmalloc with vzalloc

vzalloc combines vmalloc and memset 0.

The Coccinelle semantic patch used to make this change is as follows:
@@
type T;
T *d;
expression e;
statement S;
@@

        d =
-            vmalloc
+            vzalloc
             (...);
        if (!d) S
-       memset(d, 0, sizeof(T));
Signed-off-by: NAmitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/ddbridge/ddbridge-core.c

@@ -1569,10 +1569,9 @@ static int ddb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (pci_enable_device(pdev) < 0)
 		return -ENODEV;
 
-	dev = vmalloc(sizeof(struct ddb));
+	dev = vzalloc(sizeof(struct ddb));
 	if (dev == NULL)
 		return -ENOMEM;
-	memset(dev, 0, sizeof(struct ddb));
 
 	dev->pdev = pdev;
 	pci_set_drvdata(pdev, dev);