mov: Fix little endian audio detection

Set this field to TRUE if the audio component is to operate on
little-endian data, and FALSE otherwise.

However TRUE and FALSE are not defined. Since this flag is just a boolean,
interpret all values except for 0 as little endian.

Sample-Id: 64bit_FLOAT_Little_Endian.mov

libavformat/mov.c

@@ -944,7 +944,7 @@ static int mov_read_enda(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         return 0;
     st = c->fc->streams[c->fc->nb_streams-1];
 
-    little_endian = avio_rb16(pb);
+    little_endian = !!avio_rb16(pb);
     av_dlog(c->fc, "enda %d\n", little_endian);
     if (little_endian == 1) {
         switch (st->codec->codec_id) {