[gnome-builder] code-index: fix incorrect assertion

[Christian Hergert <chergert src gnome org>]

commit 2d46b02ee262eb769bc62d4b4d1abe96d0cf6b18
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jan 25 03:12:06 2018 -0800

    code-index: fix incorrect assertion
    
    Unlikely to hit, but can if the task was cancelled. This just
    cleans things up first to ensure we drop file instances quickly.

 src/plugins/code-index/ide-code-index-builder.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/src/plugins/code-index/ide-code-index-builder.c b/src/plugins/code-index/ide-code-index-builder.c
index f0b5f696e..9f8e65bc5 100644
--- a/src/plugins/code-index/ide-code-index-builder.c
+++ b/src/plugins/code-index/ide-code-index-builder.c
@@ -594,6 +594,13 @@ get_changes_worker (GTask        *task,
       g_queue_foreach (&files, (GFunc)file_info_free, NULL);
     }
 
+  /* In case we were cancelled */
+  if (gcd->directories.length > 0)
+    {
+      g_queue_foreach (&gcd->directories, (GFunc)g_object_unref, NULL);
+      g_queue_clear (&gcd->directories);
+    }
+
   g_assert (gcd->directories.length == 0);
   g_assert (IDE_IS_VCS (gcd->vcs));
   g_assert (G_IS_FILE (gcd->data_dir));