avformat/matroskadec: Cosmetics

Reindentation as well as marking several variables used for demuxing
RealAudio as const to clearly see that they don't change during
demuxing.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavformat/matroskadec.c

@@ -3119,12 +3119,12 @@ static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
                                    uint8_t *data, int size, uint64_t timecode,
                                    int64_t pos)
 {
-    int a = st->codecpar->block_align;
-    int sps = track->audio.sub_packet_size;
-    int cfs = track->audio.coded_framesize;
-    int h   = track->audio.sub_packet_h;
+    const int a   = st->codecpar->block_align;
+    const int sps = track->audio.sub_packet_size;
+    const int cfs = track->audio.coded_framesize;
+    const int h   = track->audio.sub_packet_h;
+    const int w   = track->audio.frame_size;
     int y   = track->audio.sub_packet_cnt;
-    int w   = track->audio.frame_size;
     int x;
 
     if (!track->audio.pkt_cnt) {