typo fix

Originally committed as revision 5642 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/movenc.c

@@ -1510,7 +1510,7 @@ static int mov_write_packet(AVFormatContext *s, AVPacket *pkt)
     if (url_is_streamed(&s->pb)) return 0; /* Can't handle that */
     if (!size) return 0; /* Discard 0 sized packets */
 
-    if (enc->codec_type == CODEC_ID_AMR_NB) {
+    if (enc->codec_id == CODEC_ID_AMR_NB) {
         /* We must find out how many AMR blocks there are in one packet */
         static uint16_t packed_size[16] =
             {13, 14, 16, 18, 20, 21, 27, 32, 6, 0, 0, 0, 0, 0, 0, 0};