memory: renesas-rpc-if: fix platform-device leak in error path

Make sure to free the flash platform device in the event that
registration fails during probe.

Fixes: ca7d8b9 ("memory: add Renesas RPC-IF driver")
Cc: stable@vger.kernel.org      # 5.8
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20220303180632.3194-1-johan@kernel.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Author: jhovold

drivers/memory/renesas-rpc-if.c

@@ -651,6 +651,7 @@ static int rpcif_probe(struct platform_device *pdev)
 	struct platform_device *vdev;
 	struct device_node *flash;
 	const char *name;
+	int ret;
 
 	flash = of_get_next_child(pdev->dev.of_node, NULL);
 	if (!flash) {
@@ -674,7 +675,14 @@ static int rpcif_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	vdev->dev.parent = &pdev->dev;
 	platform_set_drvdata(pdev, vdev);
-	return platform_device_add(vdev);
+
+	ret = platform_device_add(vdev);
+	if (ret) {
+		platform_device_put(vdev);
+		return ret;
+	}
+
+	return 0;
 }
 
 static int rpcif_remove(struct platform_device *pdev)