[sysprof] libsysprof-ui: fix private type

[Christian Hergert <chergert src gnome org>]

commit dce2eafee4a88d1166a7fc6ae0fa2af90303c8d2
Author: Christian Hergert <chergert redhat com>
Date:   Sun May 12 18:36:25 2019 -0700

    libsysprof-ui: fix private type

 src/libsysprof-ui/sysprof-marks-view.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/libsysprof-ui/sysprof-marks-view.c b/src/libsysprof-ui/sysprof-marks-view.c
index 93b005a..a9dfa5d 100644
--- a/src/libsysprof-ui/sysprof-marks-view.c
+++ b/src/libsysprof-ui/sysprof-marks-view.c
@@ -30,7 +30,7 @@ typedef struct
   GtkTreeView *tree_view;
 } SysprofMarksViewPrivate;
 
-G_DEFINE_TYPE (SysprofMarksView, sysprof_marks_view, GTK_TYPE_BIN)
+G_DEFINE_TYPE_WITH_PRIVATE (SysprofMarksView, sysprof_marks_view, GTK_TYPE_BIN)
 
 static void
 sysprof_marks_view_class_init (SysprofMarksViewClass *klass)