video: fbdev: pxafb: potential NULL dereference on error

If we "goto out;" then it calls display_timings_release(timings);
Since "timings" is NULL, that's going to oops.  Just return directly.

Fixes: 420a4882 ('video: fbdev: pxafb: initial devicetree conversion')
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/fbdev/pxafb.c

@@ -2125,7 +2125,7 @@ static int of_get_pxafb_display(struct device *dev, struct device_node *disp,
 
 	timings = of_get_display_timings(disp);
 	if (!timings)
-		goto out;
+		return -EINVAL;
 
 	ret = -ENOMEM;
 	info->modes = kmalloc_array(timings->num_timings,