USB: core: drop short-transfer check from usb_control_msg_send()

A failure to send a complete control message is always an error so
there's no need to check for short transfers in usb_control_msg_send().

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20201204085110.20055-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/message.c

@@ -219,9 +219,8 @@ int usb_control_msg_send(struct usb_device *dev, __u8 endpoint, __u8 request,
 
 	if (ret < 0)
 		return ret;
-	if (ret == size)
-		return 0;
-	return -EINVAL;
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(usb_control_msg_send);