mtd: rawnand: oxnas: Add of_node_put()

Each iteration of for_each_child_of_node puts the previous node, but in
the case of a goto from the middle of the loop, there is no put, thus
causing a memory leak. Hence add an of_node_put under a new goto to put
the node at a loop exit.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

drivers/mtd/nand/raw/oxnas_nand.c

@@ -116,7 +116,7 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 				    GFP_KERNEL);
 		if (!chip) {
 			err = -ENOMEM;
-			goto err_clk_unprepare;
+			goto err_release_child;
 		}
 
 		chip->controller = &oxnas->base;
@@ -137,12 +137,12 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 		/* Scan to find existence of the device */
 		err = nand_scan(chip, 1);
 		if (err)
-			goto err_clk_unprepare;
+			goto err_release_child;
 
 		err = mtd_device_register(mtd, NULL, 0);
 		if (err) {
 			nand_release(chip);
-			goto err_clk_unprepare;
+			goto err_release_child;
 		}
 
 		oxnas->chips[nchips] = chip;
@@ -159,6 +159,8 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 
 	return 0;
 
+err_release_child:
+	of_node_put(nand_np);
 err_clk_unprepare:
 	clk_disable_unprepare(oxnas->clk);
 	return err;