[gnome-builder] buffer: protect against NULL source location

[Christian Hergert <chergert src gnome org>]

commit 367303a10dd9836bce85e9bba935b0241ffcacec
Author: Christian Hergert <christian hergert me>
Date:   Thu Apr 28 00:57:17 2016 -0700

    buffer: protect against NULL source location

 libide/ide-buffer.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/libide/ide-buffer.c b/libide/ide-buffer.c
index 5a6ff1d..ae0cf45 100644
--- a/libide/ide-buffer.c
+++ b/libide/ide-buffer.c
@@ -163,7 +163,12 @@ ide_buffer_get_has_diagnostics (IdeBuffer *self)
     {
       IdeDiagnostic *diag = ide_diagnostics_index (priv->diagnostics, i);
       IdeSourceLocation *loc = ide_diagnostic_get_location (diag);
-      IdeFile *file = ide_source_location_get_file (loc);
+      IdeFile *file;
+
+      if (loc == NULL)
+        continue;
+
+      file = ide_source_location_get_file (loc);
 
       if (priv->file && file && ide_file_equal (priv->file, file))
         return TRUE;