serial: ifx6x60: Free memory when probe fails

When spi_setup() fails it doesn't free ifx_dev and we have a memory
leak. Fix this by freeing ifx_dev before the return.
Signed-off-by: Souptick joarder <jrdr.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/ifx6x60.c

@@ -1042,6 +1042,7 @@ static int ifx_spi_spi_probe(struct spi_device *spi)
 	ret = spi_setup(spi);
 	if (ret) {
 		dev_err(&spi->dev, "SPI setup wasn't successful %d", ret);
+		kfree(ifx_dev);
 		return -ENODEV;
 	}