net: arcnet: com20020-pci.c: 
Add null check in the com20020pci_probe

When devm_kasprintf fails, it returns a null pointer. However, this return value is not properly checked in the function com20020pci_probe. 

A null check should be added after the devm_kasprintf call to prevent potential null pointer dereference error. This is similar to the commit 050b23d081da.

CODE:
	card->tx_led.brightness_set = led_tx_set;
	card->tx_led.default_trigger = devm_kasprintf(&pdev->dev,
					GFP_KERNEL, "arc%d-%d-tx",
					dev->dev_id, i);
	card->tx_led.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
					"pci:green:tx:%d-%d",
					dev->dev_id, i);

	card->tx_led.dev = &dev->dev;
	card->recon_led.brightness_set = led_recon_set;
	card->recon_led.default_trigger = devm_kasprintf(&pdev->dev,
					GFP_KERNEL, "arc%d-%d-recon",
					dev->dev_id, i);
	card->recon_led.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
					"pci:red:recon:%d-%d",
					dev->dev_id, i);