vhost-user-test: fix crash with glib < 2.36

The prepare callback needs to be implemented with glib < 2.36,
quoting glib documentation:
"Since 2.36 this may be NULL, in which case the effect is as if the
function always returns FALSE with a timeout of -1."

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/tests/vhost-user-test.c b/tests/vhost-user-test.c
index 29205ed..29de739 100644
--- a/tests/vhost-user-test.c
+++ b/tests/vhost-user-test.c
@@ -506,11 +506,22 @@ test_migrate_source_check(GSource *source)
     return FALSE;
 }
 
+#if !GLIB_CHECK_VERSION(2,36,0)
+/* this callback is unnecessary with glib >2.36, the default
+ * prepare for the source does the same */
+static gboolean
+test_migrate_source_prepare(GSource *source, gint *timeout)
+{
+    *timeout = -1;
+    return FALSE;
+}
+#endif
+
 GSourceFuncs test_migrate_source_funcs = {
-    NULL,
-    test_migrate_source_check,
-    NULL,
-    NULL
+#if !GLIB_CHECK_VERSION(2,36,0)
+    .prepare = test_migrate_source_prepare,
+#endif
+    .check = test_migrate_source_check,
 };
 
 static void test_migrate(void)