USB: vstusb: fix compiler warning on x86-64

This fixes a reported compiler warning.

Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/misc/vstusb.c b/drivers/usb/misc/vstusb.c
index 8648470c..63dff9b 100644
--- a/drivers/usb/misc/vstusb.c
+++ b/drivers/usb/misc/vstusb.c
@@ -620,7 +620,7 @@
 				__func__);
 			retval = -EFAULT;
 		} else {
-			dev_dbg(&dev->dev, "%s: recv %d bytes from pipe %d\n",
+			dev_dbg(&dev->dev, "%s: recv %zd bytes from pipe %d\n",
 				__func__, usb_data.count, usb_data.pipe);
 		}