OMAP: OMAPFB: make omapfb start even when a display is missing a driver

Currently omapfb wants that all the display devices have a driver,
otherwise omapfb refuses to start. There's no real requirement to act
like that, and this patch will make omapfb give a warning and skip that
device.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/omapfb/omapfb-main.c

@@ -2373,9 +2373,10 @@ static int omapfb_probe(struct platform_device *pdev)
 		omap_dss_get_device(dssdev);
 
 		if (!dssdev->driver) {
-			dev_err(&pdev->dev, "no driver for display: %s\n",
+			dev_warn(&pdev->dev, "no driver for display: %s\n",
 				dssdev->name);
-			r = -ENODEV;
+			omap_dss_put_device(dssdev);
+			continue;
 		}
 
 		d = &fbdev->displays[fbdev->num_displays++];