OMAPDSS: Fix omap_dss_find_output_by_port_node() port refcount decrement

Fix omap_dss_find_output_by_port_node() port parameter refcount
decrementation. The only user of dss_of_port_get_parent_device()
function is omap_dss_find_output_by_port_node() and it assumes the
refcount of the port parameter is not decremented by the call.

Signed-off-by: Jyri Sarha <[e-mail]>
Signed-off-by: Tomi Valkeinen <[e-mail]>

drivers/video/fbdev/omap2/dss/dss-of.c

···
 	if (!port)
 		return NULL;
 
-	np = of_get_next_parent(port);
+	np = of_get_parent(port);
 
 	for (i = 0; i < 2 && np; ++i) {
 		struct property *prop;