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Fix slight FLAC seek inaccuracy e.g. when using 'trim' effect

--- a/src/flac.c

+++ b/src/flac.c

@@ -481,16 +481,11 @@

-/*

- * N.B.  Do not call this function with offset=0 when file-pointer

- * is already 0 or a block of decoded FLAC data will be discarded.

- */

 static int seek(sox_format_t * ft, uint64_t offset)

 {

   priv_t * p = (priv_t *)ft->priv;

-  int result = ft->mode == 'r' && FLAC__stream_decoder_seek_absolute(p->decoder, (FLAC__uint64)(offset / ft->signal.channels)) ?  SOX_SUCCESS : SOX_EOF;

   p->wide_sample_number = p->number_of_wide_samples = 0;

-  return result;

+  return ft->mode == 'r' && FLAC__stream_decoder_seek_absolute(p->decoder, (FLAC__uint64)(offset / ft->signal.channels)) ?  SOX_SUCCESS : SOX_EOF;

 }