usbip: Fix seqnum sign extension issue in vhci_tx_urb

JIRA: https://issues.redhat.com/browse/RHEL-78931

commit 15b93f3
Author: Xiong Nandi <xndchn@gmail.com>
Date: Wed, 1 Jan 2025 00:15:37 +0800

  The atomic_inc_return function returns an int, while priv->seqnum is an
  unsigned long. So we must cast the result to u32 to prevent potential
  sign extension and size mismatch issues.

  Signed-off-by: Xiong Nandi <xndchn@gmail.com>
  Acked-by: Shuah Khan <skhan@linuxfoundation.org>
  Link: https://lore.kernel.org/r/20241231161539.20192-2-xndchn@gmail.com
  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Desnes Nunes <desnesn@redhat.com>

Author: Desnes Nunes

drivers/usb/usbip/vhci_hcd.c

@@ -676,7 +676,7 @@ static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev)
 
 	spin_lock_irqsave(&vdev->priv_lock, flags);
 
-	priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
+	priv->seqnum = (u32)atomic_inc_return(&vhci_hcd->seqnum);
 	if (priv->seqnum == 0xffff)
 		dev_info(&urb->dev->dev, "seqnum max\n");