[mutter] native: Fix compiler warning

[Marge Bot <marge-bot src gnome org>]

commit d4a042b88d24464c5d86a01bc9c5ebf6f8ace353
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed May 5 10:29:40 2021 +0200

    native: Fix compiler warning
    
    cogl_context is only used when building with EGLDevice support,
    resulting in an "unused variable" warning otherwise.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1852>

 src/backends/native/meta-onscreen-native.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/backends/native/meta-onscreen-native.c b/src/backends/native/meta-onscreen-native.c
index eb49bd45c6..99c9d76107 100644
--- a/src/backends/native/meta-onscreen-native.c
+++ b/src/backends/native/meta-onscreen-native.c
@@ -2045,7 +2045,6 @@ meta_onscreen_native_dispose (GObject *object)
 {
   CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (object);
   CoglOnscreen *onscreen = COGL_ONSCREEN (framebuffer);
-  CoglContext *cogl_context = cogl_framebuffer_get_context (framebuffer);
   MetaOnscreenNative *onscreen_native = META_ONSCREEN_NATIVE (onscreen);
   MetaRendererNative *renderer_native = onscreen_native->renderer_native;
   MetaRendererNativeGpuData *renderer_gpu_data;
@@ -2072,6 +2071,7 @@ meta_onscreen_native_dispose (GObject *object)
       if (onscreen_native->egl.stream != EGL_NO_STREAM_KHR)
         {
           MetaEgl *egl = meta_onscreen_native_get_egl (onscreen_native);
+          CoglContext *cogl_context = cogl_framebuffer_get_context (framebuffer);
           CoglRenderer *cogl_renderer = cogl_context->display->renderer;
           CoglRendererEGL *cogl_renderer_egl = cogl_renderer->winsys;