drm/sun4i: dw-hdmi: fix error return code in sun8i_dw_hdmi_bind()

Fix to return a negative error code from the error handling case instead
of 0 in function sun8i_dw_hdmi_bind().

Fixes: b7c7436a ("drm/sun4i: Implement A83T HDMI driver")
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: NJernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: NJernej Skrabec <jernej.skrabec@siol.net>
Link: https://patchwork.freedesktop.org/patch/msgid/1605488969-5211-1-git-send-email-wangxiongfeng2@huawei.com

drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c

@@ -208,6 +208,7 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
 	phy_node = of_parse_phandle(dev->of_node, "phys", 0);
 	if (!phy_node) {
 		dev_err(dev, "Can't found PHY phandle\n");
+		ret = -EINVAL;
 		goto err_disable_clk_tmds;
 	}