[gtksourceview] Make assertion conditional

[Paolo Borelli <pborelli src gnome org>]

commit e4699fedcc9730727703e88513b2f10f0569b17d
Author: Paolo Borelli <pborelli gnome org>
Date:   Tue Dec 27 10:31:01 2011 +0100

    Make assertion conditional
    
    Only check when ENABLE_CHECK_TREE is set since it involves walking
    the list twice.

 gtksourceview/gtksourcecontextengine.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/gtksourcecontextengine.c b/gtksourceview/gtksourcecontextengine.c
index d16afed..81a93fc 100644
--- a/gtksourceview/gtksourcecontextengine.c
+++ b/gtksourceview/gtksourcecontextengine.c
@@ -1347,7 +1347,9 @@ static void
 remove_invalid (GtkSourceContextEngine *ce,
 		Segment                *segment)
 {
+#ifdef ENABLE_CHECK_TREE
 	g_assert (g_slist_find (ce->priv->invalid, segment) != NULL);
+#endif
 	ce->priv->invalid = g_slist_remove (ce->priv->invalid, segment);
 }