[gnome-builder] subprocess: ensure we have a closed stream

[Christian Hergert <chergert src gnome org>]

commit e3792fc030dab286481a3d3bffd388d536a0ba58
Author: Christian Hergert <chergert redhat com>
Date:   Wed Sep 14 00:55:45 2016 -0700

    subprocess: ensure we have a closed stream
    
    Not sure how we are hitting this case, but we should be able to protect
    against it.

 libide/subprocess/ide-breakout-subprocess.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libide/subprocess/ide-breakout-subprocess.c b/libide/subprocess/ide-breakout-subprocess.c
index 6432c4e..20f8370 100644
--- a/libide/subprocess/ide-breakout-subprocess.c
+++ b/libide/subprocess/ide-breakout-subprocess.c
@@ -313,6 +313,8 @@ communicate_result_validate_utf8 (const char            *stream_name,
   if (buffer)
     {
       const char *end;
+      if (!g_output_stream_is_closed (G_OUTPUT_STREAM (buffer)))
+        g_output_stream_close (G_OUTPUT_STREAM (buffer), NULL, NULL);
       *return_location = g_memory_output_stream_steal_data (buffer);
       if (!g_utf8_validate (*return_location, -1, &end))
         {