firmware: tegra: bpmp: 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>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/firmware/tegra/bpmp.c

@@ -3,6 +3,7 @@
  * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
  */
 
+#include <linux/cleanup.h>
 #include <linux/clk/tegra.h>
 #include <linux/genalloc.h>
 #include <linux/mailbox_client.h>
@@ -34,29 +35,24 @@ channel_to_ops(struct tegra_bpmp_channel *channel)
 
 struct tegra_bpmp *tegra_bpmp_get(struct device *dev)
 {
+	struct device_node *np __free(device_node);
 	struct platform_device *pdev;
 	struct tegra_bpmp *bpmp;
-	struct device_node *np;
 
 	np = of_parse_phandle(dev->of_node, "nvidia,bpmp", 0);
 	if (!np)
 		return ERR_PTR(-ENOENT);
 
 	pdev = of_find_device_by_node(np);
-	if (!pdev) {
-		bpmp = ERR_PTR(-ENODEV);
-		goto put;
-	}
+	if (!pdev)
+		return ERR_PTR(-ENODEV);
 
 	bpmp = platform_get_drvdata(pdev);
 	if (!bpmp) {
-		bpmp = ERR_PTR(-EPROBE_DEFER);
 		put_device(&pdev->dev);
-		goto put;
+		return ERR_PTR(-EPROBE_DEFER);
 	}
 
-put:
-	of_node_put(np);
 	return bpmp;
 }
 EXPORT_SYMBOL_GPL(tegra_bpmp_get);