[gnome-builder] jsonrpc: hold an extra ref during call

[Christian Hergert <chergert src gnome org>]

commit f366cc99e1c524be0c7456a8b35d15d9be980b54
Author: Christian Hergert <chergert redhat com>
Date:   Mon Feb 20 15:37:29 2017 -0800

    jsonrpc: hold an extra ref during call
    
    Just to be extra safe, we want to hold our own reference to the instance
    since we are borrowing the reference.

 contrib/jsonrpc-glib/jsonrpc-output-stream.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/contrib/jsonrpc-glib/jsonrpc-output-stream.c b/contrib/jsonrpc-glib/jsonrpc-output-stream.c
index e0b3348..efbfb61 100644
--- a/contrib/jsonrpc-glib/jsonrpc-output-stream.c
+++ b/contrib/jsonrpc-glib/jsonrpc-output-stream.c
@@ -179,7 +179,7 @@ jsonrpc_output_stream_write_message_async_cb (GObject      *object,
                                               gpointer      user_data)
 {
   GOutputStream *stream = (GOutputStream *)object;
-  JsonrpcOutputStream *self;
+  g_autoptr(JsonrpcOutputStream) self = NULL;
   g_autoptr(GError) error = NULL;
   g_autoptr(GTask) task = user_data;
   GBytes *bytes;
@@ -188,7 +188,8 @@ jsonrpc_output_stream_write_message_async_cb (GObject      *object,
   g_assert (G_IS_OUTPUT_STREAM (stream));
   g_assert (G_IS_ASYNC_RESULT (result));
   g_assert (G_IS_TASK (task));
-  self = g_task_get_source_object (task);
+
+  self = g_object_ref (g_task_get_source_object (task));
   g_assert (JSONRPC_IS_OUTPUT_STREAM (self));
 
   if (!g_output_stream_write_all_finish (stream, result, &n_written, &error))