[media] ddbridge: fix error handling in module_init_ddbridge()

If pci_register_driver() failed, resources allocated in
ddb_class_create() are leaked. The patch fixes it
as well as it replaces -1 with correct error code
in ddb_class_create().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

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

@@ -1497,7 +1497,7 @@ static int ddb_class_create(void)
 	ddb_class = class_create(THIS_MODULE, DDB_NAME);
 	if (IS_ERR(ddb_class)) {
 		unregister_chrdev(ddb_major, DDB_NAME);
-		return -1;
+		return PTR_ERR(ddb_class);
 	}
 	ddb_class->devnode = ddb_devnode;
 	return 0;
@@ -1701,11 +1701,18 @@ static struct pci_driver ddb_pci_driver = {
 
 static __init int module_init_ddbridge(void)
 {
+	int ret;
+
 	printk(KERN_INFO "Digital Devices PCIE bridge driver, "
 	       "Copyright (C) 2010-11 Digital Devices GmbH\n");
-	if (ddb_class_create())
-		return -1;
-	return pci_register_driver(&ddb_pci_driver);
+
+	ret = ddb_class_create();
+	if (ret < 0)
+		return ret;
+	ret = pci_register_driver(&ddb_pci_driver);
+	if (ret < 0)
+		ddb_class_destroy();
+	return ret;
 }
 
 static __exit void module_exit_ddbridge(void)