mfd: tps6594: Add null pointer check to tps6594_device_init()

devm_kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure.

Fixes: 325bec71 ("mfd: tps6594: Add driver for TI TPS6594 PMIC")
Suggested-by: Lee Jones <lee@kernel.org>
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Link: https://lore.kernel.org/r/20231208033320.49345-1-chentao@kylinos.cnSigned-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/tps6594-core.c

@@ -433,6 +433,9 @@ int tps6594_device_init(struct tps6594 *tps, bool enable_crc)
 	tps6594_irq_chip.name = devm_kasprintf(dev, GFP_KERNEL, "%s-%ld-0x%02x",
 					       dev->driver->name, tps->chip_id, tps->reg);
 
+	if (!tps6594_irq_chip.name)
+		return -ENOMEM;
+
 	ret = devm_regmap_add_irq_chip(dev, tps->regmap, tps->irq, IRQF_SHARED | IRQF_ONESHOT,
 				       0, &tps6594_irq_chip, &tps->irq_data);
 	if (ret)