staging/gdm72xx: Use dev_ printks in gdm_usb.c

fixed below checkpatch warnings.
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
Signed-off-by: YAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gdm72xx/gdm_usb.c

@@ -305,7 +305,7 @@ static int gdm_usb_send(void *priv_dev, void *data, int len,
 	unsigned long flags;
 
 	if (!udev->usbdev) {
-		printk(KERN_ERR "%s: No such device\n", __func__);
+		dev_err(&usbdev->dev, "%s: No such device\n", __func__);
 		return -ENODEV;
 	}
 
@@ -484,7 +484,7 @@ static int gdm_usb_receive(void *priv_dev,
 	unsigned long flags;
 
 	if (!udev->usbdev) {
-		printk(KERN_ERR "%s: No such device\n", __func__);
+		dev_err(&usbdev->dev, "%s: No such device\n", __func__);
 		return -ENODEV;
 	}
 
@@ -559,9 +559,9 @@ static int gdm_usb_probe(struct usb_interface *intf,
 	idProduct = L2H(usbdev->descriptor.idProduct);
 	bcdDevice = L2H(usbdev->descriptor.bcdDevice);
 
-	printk(KERN_INFO "Found GDM USB VID = 0x%04x PID = 0x%04x...\n",
-		idVendor, idProduct);
-	printk(KERN_INFO "GCT WiMax driver version %s\n", DRIVER_VERSION);
+	dev_info(&intf->dev, "Found GDM USB VID = 0x%04x PID = 0x%04x...\n",
+		 idVendor, idProduct);
+	dev_info(&intf->dev, "GCT WiMax driver version %s\n", DRIVER_VERSION);
 
 
 	if (idProduct == EMERGENCY_PID) {