[gnome-online-accounts] providerfactory: Be more strict about what is acceptable

[Debarshi Ray <debarshir src gnome org>]

commit 2778ac6358113b236c5b1e3374d5b2b336c43600
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Jan 4 16:40:21 2017 +0100

    providerfactory: Be more strict about what is acceptable

 src/goabackend/goaproviderfactory.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/goabackend/goaproviderfactory.c b/src/goabackend/goaproviderfactory.c
index 4d63217..02bb892 100644
--- a/src/goabackend/goaproviderfactory.c
+++ b/src/goabackend/goaproviderfactory.c
@@ -113,6 +113,7 @@ goa_provider_factory_get_providers_finish (GoaProviderFactory  *factory,
   GoaProviderFactoryClass *klass;
 
   g_return_val_if_fail (GOA_IS_PROVIDER_FACTORY (factory), FALSE);
+  g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 
   klass = GOA_PROVIDER_FACTORY_GET_CLASS (factory);
   return klass->get_providers_finish (factory, out_providers, result, error);