staging: ft1000: fix memory leak on error path in ft1000_probe()

ft1000dev->tx_urb and ft1000dev->rx_urb are not deallocated
if something goes wrong in ft1000_probe(). Also there is no
check for success of urb allocation. The patch fixes the both issues.

By the way, there is no sense in GFP_ATOMIC for urb allocation here,
so it is changed to GFP_KERNEL.

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ft1000/ft1000-usb/ft1000_usb.c

@@ -79,8 +79,12 @@ static int ft1000_probe(struct usb_interface *interface,
 	ft1000dev->dev = dev;
 	ft1000dev->status = 0;
 	ft1000dev->net = NULL;
-	ft1000dev->tx_urb = usb_alloc_urb(0, GFP_ATOMIC);
-	ft1000dev->rx_urb = usb_alloc_urb(0, GFP_ATOMIC);
+	ft1000dev->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
+	ft1000dev->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!ft1000dev->tx_urb || !ft1000dev->rx_urb) {
+		ret = -ENOMEM;
+		goto err_fw;
+	}
 
 	DEBUG("ft1000_probe is called\n");
 	numaltsetting = interface->num_altsetting;
@@ -209,6 +213,8 @@ static int ft1000_probe(struct usb_interface *interface,
 err_load:
 	kfree(pFileStart);
 err_fw:
+	usb_free_urb(ft1000dev->rx_urb);
+	usb_free_urb(ft1000dev->tx_urb);
 	kfree(ft1000dev);
 	return ret;
 }