drm: xlnx: db: fix a memory leak in probe

Free "dp" before returning.

Fixes: be318d0 ("drm: xlnx: dp: Reset DisplayPort IP")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/86def134-9537-4939-912e-3a424e3a75b6@moroto.mountain

Author: Dan Carpenter

drivers/gpu/drm/xlnx/zynqmp_dp.c

@@ -1716,7 +1716,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
 
 	ret = zynqmp_dp_reset(dp, true);
 	if (ret < 0)
-		return ret;
+		goto err_free;
 
 	ret = zynqmp_dp_reset(dp, false);
 	if (ret < 0)