ffmpeg: use av_get_bytes_per_sample() in place of av_get_bits_per_sample_fmt()

av_get_bits_per_sample_fmt() was deprecated.
Signed-off-by: NRonald S. Bultje <rsbultje@gmail.com>

ffmpeg.c

@@ -1801,7 +1801,7 @@ static int output_packet(AVInputStream *ist, int ist_index,
                             ret = 0;
                             /* encode any samples remaining in fifo */
                             if (fifo_bytes > 0) {
-                                int osize = av_get_bits_per_sample_fmt(enc->sample_fmt) >> 3;
+                                int osize = av_get_bytes_per_sample(enc->sample_fmt);
                                 int fs_tmp = enc->frame_size;
 
                                 av_fifo_generic_read(ost->fifo, audio_buf, fifo_bytes, NULL);