[gnome-builder] xml-pack: check pointer comparison before unref

[Christian Hergert <chergert src gnome org>]

commit 940751393f6c92a5e26e25156892951c96e33155
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jun 11 21:37:56 2018 -0700

    xml-pack: check pointer comparison before unref
    
    Make sure we don't unref/ref if the pointers are the same.

 src/plugins/xml-pack/ide-xml-analysis.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/src/plugins/xml-pack/ide-xml-analysis.c b/src/plugins/xml-pack/ide-xml-analysis.c
index 016064be0..1f616d289 100644
--- a/src/plugins/xml-pack/ide-xml-analysis.c
+++ b/src/plugins/xml-pack/ide-xml-analysis.c
@@ -79,8 +79,11 @@ ide_xml_analysis_set_diagnostics (IdeXmlAnalysis *self,
   g_return_if_fail (self != NULL);
   g_return_if_fail (diagnostics != NULL);
 
-  g_clear_pointer (&self->diagnostics, ide_diagnostics_unref);
-  self->diagnostics = ide_diagnostics_ref (diagnostics);
+  if (diagnostics != self->diagnostics)
+    {
+      g_clear_pointer (&self->diagnostics, ide_diagnostics_unref);
+      self->diagnostics = ide_diagnostics_ref (diagnostics);
+    }
 }
 
 void