[PATCH v3] mux: core: Replace manual put_device() with __free(put_device)

[Maxwell Doose <m32285159@gmail.com>]

The current code for returning on failure in mux_get() uses manual
put_device() calls. Refactor and replace them with a new variable for
the pointer to the underlying device and __free(put_device).

Signed-off-by: Maxwell Doose <m32285159@gmail.com>
---
 drivers/mux/core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mux/core.c b/drivers/mux/core.c
index 23538de2c91b..2c8d380fd81a 100644
--- a/drivers/mux/core.c
+++ b/drivers/mux/core.c
@@ -9,6 +9,7 @@
 
 #define pr_fmt(fmt) "mux-core: " fmt
 
+#include <linux/cleanup.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/err.h>
@@ -586,13 +587,13 @@ static struct mux_control *mux_get(struct device *dev, const char *mux_name,
 	if (!mux_chip)
 		return ERR_PTR(-EPROBE_DEFER);
 
+	struct device *mux_dev __free(put_device) = &mux_chip->dev;
 	controller = 0;
 	if (state) {
 		if (args.args_count > 2 || args.args_count == 0 ||
 		    (args.args_count < 2 && mux_chip->controllers > 1)) {
 			dev_err(dev, "%pOF: wrong #mux-state-cells for %pOF\n",
 				np, args.np);
-			put_device(&mux_chip->dev);
 			return ERR_PTR(-EINVAL);
 		}
 
@@ -608,7 +609,6 @@ static struct mux_control *mux_get(struct device *dev, const char *mux_name,
 		    (!args.args_count && mux_chip->controllers > 1)) {
 			dev_err(dev, "%pOF: wrong #mux-control-cells for %pOF\n",
 				np, args.np);
-			put_device(&mux_chip->dev);
 			return ERR_PTR(-EINVAL);
 		}
 
@@ -619,10 +619,11 @@ static struct mux_control *mux_get(struct device *dev, const char *mux_name,
 	if (controller >= mux_chip->controllers) {
 		dev_err(dev, "%pOF: bad mux controller %u specified in %pOF\n",
 			np, controller, args.np);
-		put_device(&mux_chip->dev);
 		return ERR_PTR(-EINVAL);
 	}
 
+	struct device *prev_mux_dev __maybe_unused = no_free_ptr(mux_dev);
+
 	return &mux_chip->mux[controller];
 }
 
-- 
2.54.0