soc/fsl/qe: Fix an error code in qe_pin_request()

BugLink: https://bugs.launchpad.net/bugs/1864773

[ Upstream commit 5674a92c ]

We forgot to set "err" on this error path.

Fixes: 1a2d397a ("gpio/powerpc: Eliminate duplication of of_get_named_gpio_flags()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

arch/powerpc/sysdev/qe_lib/gpio.c

@@ -155,8 +155,10 @@ struct qe_pin *qe_pin_request(struct device_node *np, int index)
 	if (err < 0)
 		goto err0;
 	gc = gpio_to_chip(err);
-	if (WARN_ON(!gc))
+	if (WARN_ON(!gc)) {
+		err = -ENODEV;
 		goto err0;
+	}
 
 	if (!of_device_is_compatible(gc->of_node, "fsl,mpc8323-qe-pario-bank")) {
 		pr_debug("%s: tried to get a non-qe pin\n", __func__);