gpu: ipu-v3: pre: fix device node leak in ipu_pre_lookup_by_phandle

[ Upstream commit c795f3052b60b01e80485fad98c53e5e67d093c9 ]

Before returning, call of_node_put() for the device node returned by
of_parse_phandle().

Fixes: d2a34232 ("gpu: ipu-v3: add driver for Prefetch Resolve Engine")
Signed-off-by: Tobias Jordan <Tobias.Jordan@elektrobit.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>