drm/meson: Fix refcount leak in meson_encoder_hdmi_init

of_find_device_by_node() takes reference, we should use put_device()
to release it when not need anymore.
Add missing put_device() in error path to avoid refcount
leak.

Fixes: 0af5e0b4 ("drm/meson: encoder_hdmi: switch to bridge DRM_BRIDGE_ATTACH_NO_CONNECTOR")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220511054052.51981-1-linmq006@gmail.com

drivers/gpu/drm/meson/meson_encoder_hdmi.c

@@ -435,8 +435,10 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
 		cec_fill_conn_info_from_drm(&conn_info, meson_encoder_hdmi->connector);
 
 		notifier = cec_notifier_conn_register(&pdev->dev, NULL, &conn_info);
-		if (!notifier)
+		if (!notifier) {
+			put_device(&pdev->dev);
 			return -ENOMEM;
+		}
 
 		meson_encoder_hdmi->cec_notifier = notifier;
 	}