drm/tegra: sor: Set minor after debugfs initialization

The DRM minor is needed to teardown debugfs, so it needs to be tracked
to prevent a crash on driver removal.

Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/sor.c

@@ -841,6 +841,8 @@ static int tegra_sor_debugfs_init(struct tegra_sor *sor,
 		goto free;
 	}
 
+	sor->minor = minor;
+
 	return err;
 
 free: