drm/bridge: Introduce drm_bridge_get_next_bridge()
And use it in drivers accessing the bridge->next field directly. This is part of our attempt to make the bridge chain a double-linked list based on the generic list helpers. Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191203141515.3597631-3-boris.brezillon@collabora.com
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