[PATCH v2] mtd: rawnand: lpc32xx_slc: fix GPIO descriptor leak

[Haotian Zhang <vulab@iscas.ac.cn>]

The driver calls gpiod_get_optional() in the probe function but
never calls gpiod_put() in the remove function or in the probe
error path. This leads to a GPIO descriptor resource leak.
The lpc32xx_mlc.c driver in the same directory handles this
correctly by calling gpiod_put() on both paths.

Switch to devm_gpiod_get_optional() to automatically manage
GPIO descriptor resource.

Fixes: 6b923db2867c ("mtd: rawnand: lpc32xx_slc: switch to using gpiod API")
Suggested by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Haotian Zhang <vulab@iscas.ac.cn>

---
Changes in v2:
 -Switch to devm_gpiod_get_optional()
---
 drivers/mtd/nand/raw/lpc32xx_slc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/lpc32xx_slc.c b/drivers/mtd/nand/raw/lpc32xx_slc.c
index b54d76547ffb..3ca30e7dce33 100644
--- a/drivers/mtd/nand/raw/lpc32xx_slc.c
+++ b/drivers/mtd/nand/raw/lpc32xx_slc.c
@@ -854,7 +854,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	}
 
 	/* Start with WP disabled, if available */
-	host->wp_gpio = gpiod_get_optional(&pdev->dev, NULL, GPIOD_OUT_LOW);
+	host->wp_gpio = devm_gpiod_get_optional(&pdev->dev, NULL, GPIOD_OUT_LOW);
 	res = PTR_ERR_OR_ZERO(host->wp_gpio);
 	if (res) {
 		if (res != -EPROBE_DEFER)
-- 
2.50.1.windows.1