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: ca7d8b980b67 ("memory: add Renesas RPC-IF driver")
Cc: [e-mail] # 5.8
Cc: Sergei Shtylyov <[e-mail]>
Signed-off-by: Johan Hovold <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

drivers/memory/renesas-rpc-if.c

···
 	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) {
···
 		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)