[glib] gio/tests: Add a dynamic type check assertion

[Philip Withnall <pwithnall src gnome org>]

commit c9344fd5135474471dc34e29141a186454e7473e
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Tue Nov 26 11:21:37 2013 +0000

    gio/tests: Add a dynamic type check assertion
    
    This shuts up a static analysis false positive, and adds some extra
    checking.
    
    Found by scan-build.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=113075

 gio/tests/task.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gio/tests/task.c b/gio/tests/task.c
index 7c97a82..1a1dd15 100644
--- a/gio/tests/task.c
+++ b/gio/tests/task.c
@@ -1665,7 +1665,7 @@ legacy_error_return (gpointer user_data)
     }
   else
     {
-      GSimpleAsyncResult *simple = user_data;
+      GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data);
 
       G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
       g_simple_async_result_set_error (simple,