staging: usbip: remove redundant return statements

Remove redundant return statements at the end of void functions. This
addresses the checkpatch.pl warnings:

	WARNING: void function return statements are not generally useful

Signed-off-by: Max Vozeler <max@hinterhof.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/usbip/stub_rx.c b/drivers/staging/usbip/stub_rx.c
index e0b6d6b..00e475c 100644
--- a/drivers/staging/usbip/stub_rx.c
+++ b/drivers/staging/usbip/stub_rx.c
@@ -529,7 +529,6 @@
 	}
 
 	usbip_dbg_stub_rx("Leave\n");
-	return;
 }
 
 /* recv a pdu */
diff --git a/drivers/staging/usbip/vhci_hcd.c b/drivers/staging/usbip/vhci_hcd.c
index e21c1b4..c02374b 100644
--- a/drivers/staging/usbip/vhci_hcd.c
+++ b/drivers/staging/usbip/vhci_hcd.c
@@ -1121,7 +1121,6 @@
  */
 static void the_pdev_release(struct device *dev)
 {
-	return;
 }
 
 static struct platform_device the_pdev = {
diff --git a/drivers/staging/usbip/vhci_rx.c b/drivers/staging/usbip/vhci_rx.c
index d07fcb5..00e4a54 100644
--- a/drivers/staging/usbip/vhci_rx.c
+++ b/drivers/staging/usbip/vhci_rx.c
@@ -111,8 +111,6 @@
 	usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
 
 	usbip_dbg_vhci_rx("Leave\n");
-
-	return;
 }
 
 static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev,