[at-spi2-atk] Return the appropriate value

[Emmanuele Bassi <ebassi src gnome org>]

commit 28c0445013036fb03208fa2503ce173e4ae113e2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Apr 27 11:11:27 2018 +0100

    Return the appropriate value
    
    The precondition check for a function returning a boolean should not
    return NULL.

 tests/dummyatk/my-atk-action.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/dummyatk/my-atk-action.c b/tests/dummyatk/my-atk-action.c
index 8d688cb..cb272cb 100644
--- a/tests/dummyatk/my-atk-action.c
+++ b/tests/dummyatk/my-atk-action.c
@@ -218,7 +218,7 @@ void perform_action (AtkObject *obj)
 static gboolean
 my_atk_action_do_action (AtkAction *action, gint i)
 {
-  g_return_val_if_fail (MY_IS_ATK_ACTION (action), NULL);
+  g_return_val_if_fail (MY_IS_ATK_ACTION (action), FALSE);
 
   perform_action (ATK_OBJECT (action));