serial: sccnxp: Improve error message if regulator_disable() fails

Returning an error code from .remove() makes the driver core emit the
little helpful error message:

remove callback returned a non-zero value. This will be ignored.

and then remove the device anyhow.

So replace the error return (and with it the little helpful error
message) by a more useful error message.

Fixes: 31815c08fc90 ("serial: sccnxp: Replace pdata.init/exit with regulator API")
Signed-off-by: Uwe Kleine-König <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/sccnxp.c

···
 
 	uart_unregister_driver(&s->uart);
 
-	if (!IS_ERR(s->regulator))
-		return regulator_disable(s->regulator);
+	if (!IS_ERR(s->regulator)) {
+		int ret = regulator_disable(s->regulator);
+		if (ret)
+			dev_err(&pdev->dev, "Failed to disable regulator\n");
+	}
 
 	return 0;
 }