mfd: syscon: Use scoped variables with memory allocators to simplify error paths

Allocate the memory with scoped/cleanup.h to reduce error handling and
make the code a bit simpler.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240707114823.9175-2-krzysztof.kozlowski@linaro.orgSigned-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/syscon.c

@@ -8,6 +8,7 @@
  * Author: Dong Aisheng <dong.aisheng@linaro.org>
  */
 
+#include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/hwspinlock.h>
@@ -45,7 +46,6 @@ static const struct regmap_config syscon_regmap_config = {
 static struct syscon *of_syscon_register(struct device_node *np, bool check_res)
 {
 	struct clk *clk;
-	struct syscon *syscon;
 	struct regmap *regmap;
 	void __iomem *base;
 	u32 reg_io_width;
@@ -54,20 +54,16 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_res)
 	struct resource res;
 	struct reset_control *reset;
 
-	syscon = kzalloc(sizeof(*syscon), GFP_KERNEL);
+	struct syscon *syscon __free(kfree) = kzalloc(sizeof(*syscon), GFP_KERNEL);
 	if (!syscon)
 		return ERR_PTR(-ENOMEM);
 
-	if (of_address_to_resource(np, 0, &res)) {
-		ret = -ENOMEM;
-		goto err_map;
-	}
+	if (of_address_to_resource(np, 0, &res))
+		return ERR_PTR(-ENOMEM);
 
 	base = of_iomap(np, 0);
-	if (!base) {
-		ret = -ENOMEM;
-		goto err_map;
-	}
+	if (!base)
+		return ERR_PTR(-ENOMEM);
 
 	/* Parse the device's DT node for an endianness specification */
 	if (of_property_read_bool(np, "big-endian"))
@@ -152,7 +148,7 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_res)
 	list_add_tail(&syscon->list, &syscon_list);
 	spin_unlock(&syscon_list_slock);
 
-	return syscon;
+	return_ptr(syscon);
 
 err_reset:
 	reset_control_put(reset);
@@ -163,8 +159,6 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_res)
 	regmap_exit(regmap);
 err_regmap:
 	iounmap(base);
-err_map:
-	kfree(syscon);
 	return ERR_PTR(ret);
 }