drm/tidss: Use dev_err_probe() over dev_dbg() when failing to probe the port

This gets logged out to /sys/kernel/debug/devices_deferred in the
-EPROBE_DEFER case and as an error otherwise. The message here provides
useful information to the user when troubleshooting why their display is
not working in either case, so let's make it output appropriately.

Signed-off-by: Andrew Halaney <[e-mail]>
Reviewed-by: Javier Martinez Canillas <[e-mail]>
Tested-by: Enric Balletbo i Serra <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/gpu/drm/tidss/tidss_kms.c

···
 			dev_dbg(dev, "no panel/bridge for port %d\n", i);
 			continue;
 		} else if (ret) {
-			dev_dbg(dev, "port %d probe returned %d\n", i, ret);
-			return ret;
+			return dev_err_probe(dev, ret, "port %d probe failed\n", i);
 		}
 
 		if (panel) {