ieee802154: ca8210: Add missing check for kfifo_alloc() in ca8210_probe()

ca8210_test_interface_init() returns the result of kfifo_alloc(),
which can be non-zero in case of an error. The caller, ca8210_probe(),
should check the return value and do error-handling if it fails.

Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Signed-off-by: Keisuke Nishimura <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Reviewed-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/[e-mail]
Signed-off-by: Stefan Schmidt <[e-mail]>

drivers/net/ieee802154/ca8210.c

···
 	spi_set_drvdata(priv->spi, priv);
 	if (IS_ENABLED(CONFIG_IEEE802154_CA8210_DEBUGFS)) {
 		cascoda_api_upstream = ca8210_test_int_driver_write;
-		ca8210_test_interface_init(priv);
+		ret = ca8210_test_interface_init(priv);
+		if (ret) {
+			dev_crit(&spi_device->dev, "ca8210_test_interface_init failed\n");
+			goto error;
+		}
 	} else {
 		cascoda_api_upstream = NULL;
 	}