smjpegenc: use bits_per_coded_sample instead of calling function

Final result is same and this allows support of multiple values per codec.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavformat/smjpegenc.c

@@ -67,7 +67,7 @@ static int smjpeg_write_header(AVFormatContext *s)
             avio_wl32(pb, SMJPEG_SND);
             avio_wb32(pb, 8);
             avio_wb16(pb, codec->sample_rate);
-            avio_w8(pb, av_get_bits_per_sample(codec->codec_id));
+            avio_w8(pb, codec->bits_per_coded_sample);
             avio_w8(pb, codec->channels);
             avio_wl32(pb, tag);
             avpriv_set_pts_info(st, 32, 1, 1000);