[vala] x11: Fix Display.display_string bindings

[Luca Bruno <lucabru src gnome org>]

commit 5d8b408e560cac7e9b94230c983722d2d88cd169
Author: Alexander Kurtz <kurtz alex googlemail com>
Date:   Tue Apr 5 21:10:04 2011 +0200

    x11: Fix Display.display_string bindings

 vapi/x11.vapi |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vapi/x11.vapi b/vapi/x11.vapi
index c489f27..950c045 100644
--- a/vapi/x11.vapi
+++ b/vapi/x11.vapi
@@ -76,7 +76,7 @@ namespace X {
 		public unowned Screen screen_by_id (int screen_number);
 
 		[CCode (cname = "DisplayString")]
-		public string display_string ();
+		public unowned string display_string ();
 
 		[CCode (cname = "XQLength")]
 		public int event_queue_length ();