[gnome-builder] glade: fix leak of project GFile

[Christian Hergert <chergert src gnome org>]

commit a86cab1bc2ac768fc93ae95a23f804e068f6b6c9
Author: Christian Hergert <chergert redhat com>
Date:   Mon Oct 22 13:57:18 2018 -0700

    glade: fix leak of project GFile

 src/plugins/glade/gbp-glade-view.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/plugins/glade/gbp-glade-view.c b/src/plugins/glade/gbp-glade-view.c
index f7e77f7e4..0a82d0c07 100644
--- a/src/plugins/glade/gbp-glade-view.c
+++ b/src/plugins/glade/gbp-glade-view.c
@@ -87,6 +87,7 @@ gbp_glade_view_dispose (GObject *object)
 {
   GbpGladeView *self = (GbpGladeView *)object;
 
+  g_clear_object (&self->file);
   g_clear_object (&self->project);
 
   G_OBJECT_CLASS (gbp_glade_view_parent_class)->dispose (object);