net: axienet: Fix return value check in axienet_probe()

BugLink: https://bugs.launchpad.net/bugs/1878232

commit 3ad7b147 upstream.

In case of error, the function of_parse_phandle() returns NULL
pointer not ERR_PTR(). The IS_ERR() test in the return value
check should be replaced with NULL test.

Fixes: 46aa27df ('net: axienet: Use devm_* calls')
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/net/ethernet/xilinx/xilinx_axienet_main.c

@@ -1602,9 +1602,9 @@ static int axienet_probe(struct platform_device *pdev)
 
 	/* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
 	np = of_parse_phandle(pdev->dev.of_node, "axistream-connected", 0);
-	if (IS_ERR(np)) {
+	if (!np) {
 		dev_err(&pdev->dev, "could not find DMA node\n");
-		ret = PTR_ERR(np);
+		ret = -ENODEV;
 		goto free_netdev;
 	}
 	ret = of_address_to_resource(np, 0, &dmares);