drm/rockchip: inno_hdmi: fix an error code

We were accidentally returning PTR_ERR(NULL) which means success when we
wanted to return a negative error code.

Fixes: 412d4ae6 ('drm/rockchip: hdmi: add Innosilicon HDMI support')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Yakir Yang <ykk@rock-chips.com>

drivers/gpu/drm/rockchip/inno_hdmi.c

@@ -855,8 +855,9 @@ static int inno_hdmi_bind(struct device *dev, struct device *master,
 
 	hdmi->ddc = inno_hdmi_i2c_adapter(hdmi);
 	if (IS_ERR(hdmi->ddc)) {
+		ret = PTR_ERR(hdmi->ddc);
 		hdmi->ddc = NULL;
-		return PTR_ERR(hdmi->ddc);
+		return ret;
 	}
 
 	/*