i2c: mux: demux-pinctrl: check initial mux selection, too

[ Upstream commit ca89f73 ]

When misconfigured, the initial setup of the current mux channel can
fail, too. It must be checked as well.

Fixes: 50a5ba8 ("i2c: mux: demux-pinctrl: add driver")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 573f036)

Author: Wolfram Sang

drivers/i2c/muxes/i2c-demux-pinctrl.c

@@ -261,7 +261,9 @@ static int i2c_demux_pinctrl_probe(struct platform_device *pdev)
 	pm_runtime_no_callbacks(&pdev->dev);
 
 	/* switch to first parent as active master */
-	i2c_demux_activate_master(priv, 0);
+	err = i2c_demux_activate_master(priv, 0);
+	if (err)
+		goto err_rollback;
 
 	err = device_create_file(&pdev->dev, &dev_attr_available_masters);
 	if (err)