iio: dac: vf610: Fix an error handling path in 'vf610_dac_probe()'

A call to 'vf610_dac_exit()' is missing in an error handling path.

Fixes: 1b983bf4 ("iio: dac: vf610_dac: Add IIO DAC driver for Vybrid SoC")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/dac/vf610_dac.c

@@ -223,6 +223,7 @@ static int vf610_dac_probe(struct platform_device *pdev)
 	return 0;
 
 error_iio_device_register:
+	vf610_dac_exit(info);
 	clk_disable_unprepare(info->clk);
 
 	return ret;