[wing] wingiocpoutputstream: fix memory leak on wing_iocp_output_stream_write_async

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 16be4727fe8e70b7ab3c590f41c3719fba2b8895
Author: Silvio Lazzeretti <silviola amazon com>
Date:   Mon Mar 1 18:05:22 2021 +0100

    wingiocpoutputstream: fix memory leak on wing_iocp_output_stream_write_async

 wing/wingiocpoutputstream.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/wing/wingiocpoutputstream.c b/wing/wingiocpoutputstream.c
index e88525c..b14d72f 100644
--- a/wing/wingiocpoutputstream.c
+++ b/wing/wingiocpoutputstream.c
@@ -224,7 +224,10 @@ wing_iocp_output_stream_write_async (GOutputStream       *stream,
   g_task_set_priority (task, io_priority);
 
   if (g_task_return_error_if_cancelled (task))
-    return;
+    {
+      g_object_unref (task);
+      return;
+    }
 
   if (priv->handle == INVALID_HANDLE_VALUE)
     {