usbip: Remove unnecessary null check

"vdev" points to vhci_hcd->vdev[] array and vhci_hcd->vdev[] array
is not a pointer array but a structure array and it is already used
in vhci_urb_enqueue() and then passed to vhci_tx_urb() as an argument.
vhci_tx_urb() is not called except vhci_urb_enqueue(). So, "vdev"
can not be null pointer. This null check statement is meaningless.
Signed-off-by: Suwan Kim <suwan.kim027@gmail.com>
Acked-by: Shuah Khan <shuah@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/usbip/vhci_hcd.c

@@ -654,15 +654,9 @@ static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev)
 {
 	struct vhci_priv *priv;
-	struct vhci_hcd *vhci_hcd;
+	struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
 	unsigned long flags;
 
-	if (!vdev) {
-		pr_err("could not get virtual device");
-		return;
-	}
-	vhci_hcd = vdev_to_vhci_hcd(vdev);
-
 	priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
 	if (!priv) {
 		usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);