Generating server icon leaks encoded data buffer

ByteBuf bytebuf = Unpooled.buffer();

try
{
	BufferedImage bufferedimage = ImageIO.read(file1);
	Validate.validState(bufferedimage.getWidth() == 64, "Must be 64 pixels wide");
	Validate.validState(bufferedimage.getHeight() == 64, "Must be 64 pixels high");
	ImageIO.write(bufferedimage, "PNG", new ByteBufOutputStream(bytebuf));
	ByteBuf bytebuf1 = Base64.encode(bytebuf);
	response.setFavicon("data:image/png;base64," + bytebuf1.toString(StandardCharsets.UTF_8));
}
catch (Exception exception)
{
	LOGGER.error("Couldn't load server icon", (Throwable)exception);
}
finally
{
	bytebuf.release();
}