usb: dwc3: qcom: use scoped device node handling to simplify error paths

Obtain the device node reference with scoped/cleanup.h to reduce error
handling and make the code a bit simpler.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20240814-b4-cleanup-h-of-node-put-usb-v1-7-95481b9682bc@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: krzk

drivers/usb/dwc3/dwc3-qcom.c

@@ -4,6 +4,7 @@
  * Inspired by dwc3-of-simple.c
  */
 
+#include <linux/cleanup.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/clk.h>
@@ -702,11 +703,12 @@ static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
 static int dwc3_qcom_of_register_core(struct platform_device *pdev)
 {
 	struct dwc3_qcom	*qcom = platform_get_drvdata(pdev);
-	struct device_node	*np = pdev->dev.of_node, *dwc3_np;
+	struct device_node	*np = pdev->dev.of_node;
 	struct device		*dev = &pdev->dev;
 	int			ret;
 
-	dwc3_np = of_get_compatible_child(np, "snps,dwc3");
+	struct device_node *dwc3_np __free(device_node) = of_get_compatible_child(np,
+										  "snps,dwc3");
 	if (!dwc3_np) {
 		dev_err(dev, "failed to find dwc3 core child\n");
 		return -ENODEV;
@@ -715,7 +717,7 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev)
 	ret = of_platform_populate(np, NULL, NULL, dev);
 	if (ret) {
 		dev_err(dev, "failed to register dwc3 core - %d\n", ret);
-		goto node_put;
+		return ret;
 	}
 
 	qcom->dwc3 = of_find_device_by_node(dwc3_np);
@@ -725,9 +727,6 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev)
 		of_platform_depopulate(dev);
 	}
 
-node_put:
-	of_node_put(dwc3_np);
-
 	return ret;
 }