avformat/matroskadec: make sipr_bit_rate static const

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/matroskadec.c

@@ -1765,7 +1765,7 @@ static int matroska_read_header(AVFormatContext *s)
                 track->codec_priv.size = 0;
             } else {
                 if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
-                    const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
+                    static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
                     track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
                     st->codec->bit_rate = sipr_bit_rate[flavor];
                 }