mtd: rawnand: intel: check return value of devm_kasprintf()

devm_kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure. Ensure the allocation was successful by
checking the pointer validity.

Fixes: 0b1039f0 ("mtd: rawnand: Add NAND controller support on Intel LGM SoC")
Signed-off-by: Yi Yang <yiyang13@huawei.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20231019065537.318391-1-yiyang13@huawei.com

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

@@ -619,6 +619,11 @@ static int ebu_nand_probe(struct platform_device *pdev)
 	ebu_host->cs_num = cs;
 
 	resname = devm_kasprintf(dev, GFP_KERNEL, "nand_cs%d", cs);
+	if (!resname) {
+		ret = -ENOMEM;
+		goto err_of_node_put;
+	}
+
 	ebu_host->cs[cs].chipaddr = devm_platform_ioremap_resource_byname(pdev,
 									  resname);
 	if (IS_ERR(ebu_host->cs[cs].chipaddr)) {
@@ -649,6 +654,11 @@ static int ebu_nand_probe(struct platform_device *pdev)
 	}
 
 	resname = devm_kasprintf(dev, GFP_KERNEL, "addr_sel%d", cs);
+	if (!resname) {
+		ret = -ENOMEM;
+		goto err_cleanup_dma;
+	}
+
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, resname);
 	if (!res) {
 		ret = -EINVAL;