regulator: wm8994: Don't use devres for enable GPIOs

The regulator core takes over managing the lifetime of the enable GPIO
once the regulator is registered. As such we shouldn't register the
enable GPIO using devm, or it will be freed twice.
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/wm8994-regulator.c

@@ -147,8 +147,11 @@ static int wm8994_ldo_probe(struct platform_device *pdev)
 	config.regmap = wm8994->regmap;
 	config.init_data = &ldo->init_data;
 
-	/* Look up LDO enable GPIO from the parent device node */
-	gpiod = devm_gpiod_get_optional(pdev->dev.parent,
+	/*
+	 * Look up LDO enable GPIO from the parent device node, we don't
+	 * use devm because the regulator core will free the GPIO
+	 */
+	gpiod = gpiod_get_optional(pdev->dev.parent,
 				   id ? "wlf,ldo2ena" : "wlf,ldo1ena",
 				   GPIOD_OUT_LOW |
 				   GPIOD_FLAGS_BIT_NONEXCLUSIVE);
@@ -184,6 +187,7 @@ static int wm8994_ldo_probe(struct platform_device *pdev)
 	return 0;
 
 err:
+	gpiod_put(gpiod);
 	return ret;
 }