Function returning void should not return a value :-)

--- src/gtk/glx_3Demu.cpp.orig	2014-02-01 16:26:52.801231527 +0100
+++ src/gtk/glx_3Demu.cpp	2014-02-01 16:27:17.632357063 +0100
@@ -41,11 +41,7 @@ void deinit_glx_3Demu(void)
         glXDestroyContext(dpy, ctx);
 
         XCloseDisplay(dpy);
-
-        return true;
     }
-
-    return false;
 }
 
 int init_glx_3Demu(void) 
