[gtk+] GdkGLContextX11: Don't free NULL visual info

[Alexander Larsson <alexl src gnome org>]

commit d5cd05a0f49464993f583ce15e54ceaae5c1988d
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Oct 29 11:25:21 2014 +0100

    GdkGLContextX11: Don't free NULL visual info

 gdk/x11/gdkglcontext-x11.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/gdk/x11/gdkglcontext-x11.c b/gdk/x11/gdkglcontext-x11.c
index 12a6b8a..a6f8213 100644
--- a/gdk/x11/gdkglcontext-x11.c
+++ b/gdk/x11/gdkglcontext-x11.c
@@ -634,10 +634,7 @@ find_fbconfig_for_visual (GdkDisplay        *display,
 
       visinfo = glXGetVisualFromFBConfig (dpy, configs[i]);
       if (visinfo == NULL)
-        {
-          XFree (visinfo);
-          continue;
-        }
+        continue;
 
       if (visinfo->visualid != xvisual_id)
         continue;