[gtk+/treeview-refactor] Handle NULL intp in test_increment_intp()

[Tristan Van Berkom <tvb src gnome org>]

commit 0feb08a4bbfb09dc514e00d4a6aae0c5cb0c34da
Author: Martin Nordholts <martinn src gnome org>
Date:   Sun Oct 31 00:06:48 2010 +0200

    Handle NULL intp in test_increment_intp()
    
    Support passing NULL for &int to gtk_test_display_button_window() so
    we can use that function also when we are not interested in counting
    clicks.

 gtk/gtktestutils.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtktestutils.c b/gtk/gtktestutils.c
index c2306fe..704674b 100644
--- a/gtk/gtktestutils.c
+++ b/gtk/gtktestutils.c
@@ -544,7 +544,8 @@ try_main_quit (void)
 static int
 test_increment_intp (int *intp)
 {
-  *intp += 1;
+  if (intp != NULL)
+    *intp += 1;
   return 1; /* TRUE in case we're connected to event signals */
 }