[frogr] Return the right type in g_return_val_if_vail

[Mario Sanchez Prada <msanchez src gnome org>]

commit 72a6a8d879a3db66b38c47a65ccf261abf23c87a
Author: Mario Sanchez Prada <msanchez gnome org>
Date:   Sun Dec 20 23:21:57 2015 +0000

    Return the right type in g_return_val_if_vail

 src/frogr-controller.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/frogr-controller.c b/src/frogr-controller.c
index 2604eac..5ab395a 100644
--- a/src/frogr-controller.c
+++ b/src/frogr-controller.c
@@ -2626,14 +2626,14 @@ frogr_controller_set_active_account (FrogrController *self, const gchar *usernam
 FrogrAccount *
 frogr_controller_get_active_account (FrogrController *self)
 {
-  g_return_val_if_fail(FROGR_IS_CONTROLLER (self), FROGR_STATE_UNKNOWN);
+  g_return_val_if_fail(FROGR_IS_CONTROLLER (self), NULL);
   return self->account;
 }
 
 GSList *
 frogr_controller_get_all_accounts (FrogrController *self)
 {
-  g_return_val_if_fail(FROGR_IS_CONTROLLER (self), FROGR_STATE_UNKNOWN);
+  g_return_val_if_fail(FROGR_IS_CONTROLLER (self), NULL);
   return frogr_config_get_accounts (self->config);
 }