video: fbdev: omapfb: Add missing of_node_put() in dvic_probe_of

The device_node pointer is returned by of_parse_phandle()  with refcount
incremented. We should use of_node_put() on it when done.

Fixes: f76ee892 ("omapfb: copy omapdss & displays for omapfb")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>