drm_select_eld should check for mode_config.connection_mutex as
well as mode_config.mutex: We need that since this function checks
conector->encoder links.
Signed-off-by: NSean Paul <seanpaul@chromium.org>
[danvet: Pimp commit message slightly.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>