gpu: ipu-v3: prg: fix device node leak in ipu_prg_lookup_by_phandle

[ Upstream commit 3addaba8141bc6a4f649a48f46e552af32922147 ]

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

Fixes: ea9c2605 ("gpu: ipu-v3: add driver for Prefetch Resolve Gasket")
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>