drm/mediatek/dp: fix memory leak on ->get_edid callback error path

Setting new_edid to NULL leaks the buffer.

Fixes: f70ac097 ("drm/mediatek: Add MT8195 Embedded DisplayPort driver")
Cc: Markus Schneider-Pargmann <msp@baylibre.com>
Cc: Guillaume Ranquet <granquet@baylibre.com>
Cc: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Cc: CK Hu <ck.hu@mediatek.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Cc: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-mediatek@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: <stable@vger.kernel.org> # v6.1+
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Guillaume Ranquet <granquet@baylibre.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20230914131058.2472260-1-jani.nikula@intel.com/Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

drivers/gpu/drm/mediatek/mtk_dp.c

@@ -2063,6 +2063,7 @@ static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
 	 */
 	if (mtk_dp_parse_capabilities(mtk_dp)) {
 		drm_err(mtk_dp->drm_dev, "Can't parse capabilities\n");
+		kfree(new_edid);
 		new_edid = NULL;
 	}