[gnome-builder] makecache: explicitely clear fdcopy

[Christian Hergert <chergert src gnome org>]

commit 43bac6d1b541dd2613d2e0aaae185b9c15fa61a7
Author: Christian Hergert <christian hergert me>
Date:   Sat Oct 3 16:40:00 2015 -0700

    makecache: explicitely clear fdcopy
    
    For the children.

 plugins/autotools/ide-makecache.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/plugins/autotools/ide-makecache.c b/plugins/autotools/ide-makecache.c
index 0760976..c224fe8 100644
--- a/plugins/autotools/ide-makecache.c
+++ b/plugins/autotools/ide-makecache.c
@@ -607,6 +607,7 @@ ide_makecache_new_worker (GTask        *task,
   g_subprocess_launcher_set_cwd (launcher, workdir);
   g_subprocess_launcher_take_stdout_fd (launcher, fdcopy);
   subprocess = g_subprocess_launcher_spawn (launcher, &error, GNU_MAKE_NAME, "-p", "-n", "-s", NULL);
+  fdcopy = -1;
 
   if (!subprocess)
     {