drm: Print device information again in debugfs

I was a bit over-eager in my cleanup in

commit 95c081c17f284de50eaca60d4d55643a64d39019
Author: Daniel Vetter <[e-mail]>
Date: Tue Jun 21 10:54:12 2016 +0200

drm: Move master pointer from drm_minor to drm_device

Noticed by Chris Wilson.

Fixes: 95c081c17f28 ("drm: Move master pointer from drm_minor to drm_device")
Cc: Chris Wilson <[e-mail]>
Cc: Chris Wilson <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: Emil Velikov <[e-mail]>
Cc: Julia Lawall <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Tested-by: Chris Wilson <[e-mail]>
Reviewed-by: Emil Velikov <[e-mail]>
Signed-off-by: Dave Airlie <[e-mail]>

drivers/gpu/drm/drm_info.c

···
 
 	mutex_lock(&dev->master_mutex);
 	master = dev->master;
-	if (!master)
-		goto out_unlock;
-
 	seq_printf(m, "%s", dev->driver->name);
 	if (dev->dev)
 		seq_printf(m, " dev=%s", dev_name(dev->dev));
···
 	if (dev->unique)
 		seq_printf(m, " unique=%s", dev->unique);
 	seq_printf(m, "\n");
-out_unlock:
 	mutex_unlock(&dev->master_mutex);
 
 	return 0;