[gtk-vnc] Avoid a GCC warning

[Jonh Wendell <jwendell src gnome org>]

commit 5d286f162ffc5ee6a2d3300a579cdb293a15c4c1
Author: Jonh Wendell <jwendell gnome org>
Date:   Tue Oct 20 21:23:03 2009 -0300

    Avoid a GCC warning

 src/coroutine_gthread.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/coroutine_gthread.c b/src/coroutine_gthread.c
index 4c684c5..14231a0 100644
--- a/src/coroutine_gthread.c
+++ b/src/coroutine_gthread.c
@@ -106,7 +106,7 @@ int coroutine_init(struct coroutine *co)
 	return 0;
 }
 
-int coroutine_release(struct coroutine *co)
+int coroutine_release(struct coroutine *co G_GNUC_UNUSED)
 {
 	return 0;
 }