net: ieee802154: mcr20a: do not leak resources on error path

We already allocated the device and platform  data at this
point. Instead of simply return from the probe function we
need to cleanup the resources first.
Signed-off-by: NStefan Schmidt <stefan@osg.samsung.com>
Acked-by: NXue Liu <liuxuenetmail@gmail.com>

drivers/net/ieee802154/mcr20a.c

@@ -1309,8 +1309,10 @@ mcr20a_probe(struct spi_device *spi)
 	/* init buf */
 	lp->buf = devm_kzalloc(&spi->dev, SPI_COMMAND_BUFFER, GFP_KERNEL);
 
-	if (!lp->buf)
-		return -ENOMEM;
+	if (!lp->buf) {
+		ret = -ENOMEM;
+		goto free_dev;
+	}
 
 	mcr20a_setup_tx_spi_messages(lp);
 	mcr20a_setup_rx_spi_messages(lp);