drm: rcar-du: Fix compilation warning

drm: rcar-du: Fix compilation warning

Commit 8dbf78c23867 ("drm: rcar-du: Use generic
drm_connector_register_all() helper") left an unused local variable
behind. Remove it.

Fixes: 8dbf78c23867 ("drm: rcar-du: Use generic drm_connector_register_all() helper")
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1461336879-2469-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com