[gnome-builder] build-task: fix parent instance type

[Christian Hergert <chergert src gnome org>]

commit b0703c9a09a039d56dea2626db4cfe67cf718954
Author: Christian Hergert <christian hergert me>
Date:   Mon Feb 29 13:40:02 2016 -0800

    build-task: fix parent instance type
    
    Technically this was fine, since IdeBuildResult didn't add anything to
    the parent structure. But should be fixed either way.

 plugins/autotools/ide-autotools-build-task.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/autotools/ide-autotools-build-task.c b/plugins/autotools/ide-autotools-build-task.c
index ff58fab..a1377b5 100644
--- a/plugins/autotools/ide-autotools-build-task.c
+++ b/plugins/autotools/ide-autotools-build-task.c
@@ -30,7 +30,7 @@
 
 struct _IdeAutotoolsBuildTask
 {
-  IdeObject         parent_instance;
+  IdeBuildResult    parent;
   IdeConfiguration *configuration;
   GFile            *directory;
   GPtrArray        *extra_targets;