[libpeas] Add checks to peas_extension_callv()

[Garrett Regier <gregier src gnome org>]

commit c33842a325cc5f7bba53c7b6fa128597cec8a75a
Author: Garrett Regier <garrettregier gmail com>
Date:   Sun Dec 11 08:35:15 2011 -0800

    Add checks to peas_extension_callv()

 libpeas/peas-extension.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/libpeas/peas-extension.c b/libpeas/peas-extension.c
index 63a3407..a1c9817 100644
--- a/libpeas/peas-extension.c
+++ b/libpeas/peas-extension.c
@@ -255,6 +255,9 @@ peas_extension_callv (PeasExtension *exten,
   GType interface;
   gboolean success;
 
+  g_return_val_if_fail (PEAS_IS_EXTENSION (exten), FALSE);
+  g_return_val_if_fail (method_name != NULL, FALSE);
+
   method_info = get_method_info (exten, method_name, &interface);
 
   /* Already warned */