huffman: pass hnode_first as a flag instead of as an argument on its own

Originally committed as revision 12373 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/huffman.h

@@ -32,8 +32,10 @@ typedef struct {
     uint32_t count;
 } Node;
 
+#define FF_HUFFMAN_FLAG_HNODE_FIRST 0x01
+
 typedef int (*huff_cmp_t)(const void *va, const void *vb);
 int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes,
-                       Node *nodes, huff_cmp_t cmp, int hnode_first);
+                       Node *nodes, huff_cmp_t cmp, int flags);
 
 #endif /* FFMPEG_HUFFMAN_H */