drm/bridge: lt9611uxc: use int for holding number of modes

lt9611uxc_connector_get_modes() propagates the return value of
drm_edid_connector_add_modes() but stores the int temporarily in an
unsigned int. Use the correct type.

Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Cc: Robert Foss <rfoss@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/ed97f4f036263cdc4f34330cef91214970f99a77.1709913674.git.jani.nikula@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/bridge/lontium-lt9611uxc.c

@@ -294,8 +294,8 @@ static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
 static int lt9611uxc_connector_get_modes(struct drm_connector *connector)
 {
 	struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
-	unsigned int count;
 	const struct drm_edid *drm_edid;
+	int count;
 
 	drm_edid = drm_bridge_edid_read(&lt9611uxc->bridge, connector);
 	drm_edid_connector_update(connector, drm_edid);