egl/wayland: Send commit after flushing the driver context

This typically won't make a difference, since we only send the requests at
wl_display_flush() time.  There might be a small race
with another thread calling wl_display_flush() after our commit request,
but before we flush the DRI driver.  Moving the commit below the DRI
driver flush call looks more natural and eliminates the small race.

Cc: "10.0" mesa-stable@lists.freedesktop.org

src/egl/drivers/dri2/platform_wayland.c

@@ -610,11 +610,10 @@ dri2_swap_buffers_with_damage(_EGLDriver *drv,
       }
    }
 
-   wl_surface_commit(dri2_surf->wl_win->surface);
-
    (*dri2_dpy->flush->flush)(dri2_surf->dri_drawable);
    (*dri2_dpy->flush->invalidate)(dri2_surf->dri_drawable);
 
+   wl_surface_commit(dri2_surf->wl_win->surface);
    wl_display_flush(dri2_dpy->wl_dpy);
 
    return EGL_TRUE;