mtd: rawnand: intel: Add missing of_node_put() in ebu_nand_probe()

The 'chip_np' returned by of_get_next_child() with refcount decremented,
of_node_put() need be called in error path to decrease the refcount.

Fixes: bfc618fc ("mtd: rawnand: intel: Read the chip-select line from the correct OF node")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220924131010.957117-1-yangyingliang@huawei.com

drivers/mtd/nand/raw/intel-nand-controller.c

@@ -608,11 +608,12 @@ static int ebu_nand_probe(struct platform_device *pdev)
 	ret = of_property_read_u32(chip_np, "reg", &cs);
 	if (ret) {
 		dev_err(dev, "failed to get chip select: %d\n", ret);
-		return ret;
+		goto err_of_node_put;
 	}
 	if (cs >= MAX_CS) {
 		dev_err(dev, "got invalid chip select: %d\n", cs);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err_of_node_put;
 	}
 
 	ebu_host->cs_num = cs;
@@ -620,18 +621,22 @@ static int ebu_nand_probe(struct platform_device *pdev)
 	resname = devm_kasprintf(dev, GFP_KERNEL, "nand_cs%d", cs);
 	ebu_host->cs[cs].chipaddr = devm_platform_ioremap_resource_byname(pdev,
 									  resname);
-	if (IS_ERR(ebu_host->cs[cs].chipaddr))
-		return PTR_ERR(ebu_host->cs[cs].chipaddr);
+	if (IS_ERR(ebu_host->cs[cs].chipaddr)) {
+		ret = PTR_ERR(ebu_host->cs[cs].chipaddr);
+		goto err_of_node_put;
+	}
 
 	ebu_host->clk = devm_clk_get(dev, NULL);
-	if (IS_ERR(ebu_host->clk))
-		return dev_err_probe(dev, PTR_ERR(ebu_host->clk),
-				     "failed to get clock\n");
+	if (IS_ERR(ebu_host->clk)) {
+		ret = dev_err_probe(dev, PTR_ERR(ebu_host->clk),
+				    "failed to get clock\n");
+		goto err_of_node_put;
+	}
 
 	ret = clk_prepare_enable(ebu_host->clk);
 	if (ret) {
 		dev_err(dev, "failed to enable clock: %d\n", ret);
-		return ret;
+		goto err_of_node_put;
 	}
 
 	ebu_host->dma_tx = dma_request_chan(dev, "tx");
@@ -695,6 +700,8 @@ static int ebu_nand_probe(struct platform_device *pdev)
 	ebu_dma_cleanup(ebu_host);
 err_disable_unprepare_clk:
 	clk_disable_unprepare(ebu_host->clk);
+err_of_node_put:
+	of_node_put(chip_np);
 
 	return ret;
 }