[glib] g_test_expect_message: add some g_return_if_fail

[Ryan Lortie <ryanl src gnome org>]

commit d06c7a911ea28d9d8019b901f71bd12cfa2dd64d
Author: Ryan Lortie <desrt desrt ca>
Date:   Mon Aug 20 16:25:09 2012 -0400

    g_test_expect_message: add some g_return_if_fail
    
    NULL domain is not supported and some might expect this to work, so make
    sure they don't get the wrong idea...

 glib/gmessages.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/glib/gmessages.c b/glib/gmessages.c
index c83d3e8..decda04 100644
--- a/glib/gmessages.c
+++ b/glib/gmessages.c
@@ -1101,6 +1101,10 @@ g_test_expect_message (const gchar    *log_domain,
 {
   GTestExpectedMessage *expected;
 
+  g_return_if_fail (log_domain != NULL);
+  g_return_if_fail (log_level != 0);
+  g_return_if_fail (pattern != NULL);
+
   expected = g_new (GTestExpectedMessage, 1);
   expected->log_domain = g_strdup (log_domain);
   expected->log_level = log_level;