commit 955906aa647d0d233b422c979e1ee81dc32abb87
Author: Brian <brian@yutani.localnet.net>
Date:   Tue Mar 6 16:25:07 2007 -0700

    fix renderbuffer mem leak

diff --git a/src/mesa/drivers/x11/xm_buffer.c b/src/mesa/drivers/x11/xm_buffer.c
index a358ec2..747971a 100644
--- a/src/mesa/drivers/x11/xm_buffer.c
+++ b/src/mesa/drivers/x11/xm_buffer.c
@@ -418,6 +418,18 @@ xmesa_delete_framebuffer(struct gl_frame
       XMesaDestroyImage( b->rowimage );
    }
 
+   /* Note that XMesaBuffer renderbuffers normally have a refcount of 2
+    * (creation + binding) so we need to explicitly delete/unbind them here.
+    */
+   if (b->frontxrb) {
+      _mesa_unreference_renderbuffer((struct gl_renderbuffer **) &b->frontxrb);
+      ASSERT(b->frontxrb == NULL);
+   }
+   if (b->backxrb) {
+      _mesa_unreference_renderbuffer((struct gl_renderbuffer **) &b->backxrb);
+      ASSERT(b->backxrb == NULL);
+   }
+
    _mesa_free_framebuffer_data(fb);
    _mesa_free(fb);
 }