V4L/DVB (3202): Initialize the dvb-usb-device-pointer to NULL

- Initialize the the dvb-usb-device-pointer in the -init function to NULL,
to be sure that a dvb-usb-device was really initialized.
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>

drivers/media/dvb/dvb-usb/dvb-usb-init.c

@@ -138,6 +138,9 @@ int dvb_usb_device_init(struct usb_interface *intf, struct dvb_usb_properties
 
 	int ret = -ENOMEM,cold=0;
 
+	if (du != NULL)
+		*du = NULL;
+
 	if ((desc = dvb_usb_find_device(udev,props,&cold)) == NULL) {
 		deb_err("something went very wrong, device was not found in current device list - let's see what comes next.\n");
 		return -ENODEV;