SVG: kill unused warning

modules/text_renderer/svg.c

@@ -432,6 +432,8 @@ static int RenderText( filter_t *p_filter, subpicture_region_t *p_region_out,
                        subpicture_region_t *p_region_in,
                        const vlc_fourcc_t *p_chroma_list )
 {
+    VLC_UNUSED(p_chroma_list);
+
     filter_sys_t *p_sys = p_filter->p_sys;
     svg_rendition_t *p_svg = NULL;
     char *psz_string;