flac: use demux_IsContentType()

modules/demux/flac.c

@@ -119,16 +119,9 @@ static int Open( vlc_object_t * p_this )
 
     if( p_peek[0]!='f' || p_peek[1]!='L' || p_peek[2]!='a' || p_peek[3]!='C' )
     {
-        if( !p_demux->b_force )
-        {
-            char *psz_mime = stream_ContentType( p_demux->s );
-            if ( !psz_mime || strcmp( psz_mime, "audio/flac" ) )
-            {
-                free( psz_mime );
+        if( !p_demux->b_force
+         && !demux_IsContentType( p_demux, "audio/flac" ) )
             return VLC_EGENERIC;
-            }
-            free( psz_mime );
-        }
 
         /* User forced */
         msg_Err( p_demux, "this doesn't look like a flac stream, "