--- gtkcsstypes.c.orig	2012-02-07 07:35:12.263905891 +0900
+++ gtkcsstypes.c	2012-02-07 07:35:20.439910659 +0900
@@ -131,9 +131,6 @@
 {
   char buf[G_ASCII_DTOSTR_BUF_SIZE];
 
-  g_return_if_fail (number != NULL);
-  g_return_if_fail (string != NULL);
-
   const char *names[] = {
     /* [GTK_CSS_NUMBER] = */ "",
     /* [GTK_CSS_PERCENT] = */ "%",
@@ -151,6 +148,9 @@
     /* [GTK_CSS_TURN] = */ "turn",
   };
 
+  g_return_if_fail (number != NULL);
+  g_return_if_fail (string != NULL);
+
   g_ascii_dtostr (buf, sizeof (buf), number->value);
   g_string_append (string, buf);
   if (number->value != 0.0)
