[libpeas] Warn if activate or deactivate are not implemented

[Garrett Regier <gregier src gnome org>]

commit a4e55fd3dcf7bf37ce9cc21c87a2bbb68ce6fdff
Author: Garrett Regier <garrettregier gmail com>
Date:   Tue Jul 17 11:41:43 2012 -0700

    Warn if activate or deactivate are not implemented
    
    https://bugzilla.gnome.org/show_bug.cgi?id=679508

 libpeas/peas-activatable.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/libpeas/peas-activatable.c b/libpeas/peas-activatable.c
index 2658aed..434642c 100644
--- a/libpeas/peas-activatable.c
+++ b/libpeas/peas-activatable.c
@@ -91,8 +91,9 @@ peas_activatable_activate (PeasActivatable *activatable)
   g_return_if_fail (PEAS_IS_ACTIVATABLE (activatable));
 
   iface = PEAS_ACTIVATABLE_GET_IFACE (activatable);
-  if (iface->activate != NULL)
-    iface->activate (activatable);
+  g_return_if_fail (iface->activate != NULL);
+
+  iface->activate (activatable);
 }
 
 /**
@@ -113,8 +114,9 @@ peas_activatable_deactivate (PeasActivatable *activatable)
   g_return_if_fail (PEAS_IS_ACTIVATABLE (activatable));
 
   iface = PEAS_ACTIVATABLE_GET_IFACE (activatable);
-  if (iface->deactivate != NULL)
-    iface->deactivate (activatable);
+  g_return_if_fail (iface->deactivate != NULL);
+
+  iface->deactivate (activatable);
 }
 
 /**