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src/io/source_sndfile.c: fix resampled position in _seek, improve test for non integer ratios

--- a/src/io/source_sndfile.c

+++ b/src/io/source_sndfile.c

@@ -263,7 +263,7 @@

 }

 uint_t aubio_source_sndfile_seek (aubio_source_sndfile_t * s, uint_t pos) {

-  uint_t resampled_pos = (uint_t)ROUND(pos * s->ratio);

+  uint_t resampled_pos = (uint_t)ROUND(pos / s->ratio);

   return sf_seek (s->handle, resampled_pos, SEEK_SET);

 }

--- a/tests/src/io/test-source_seek.c

+++ b/tests/src/io/test-source_seek.c

@@ -84,7 +84,9 @@

 beach:

   del_fvec (vec);

+  // check that we got exactly the same number of frames

   assert ( old_n_frames_2 == old_n_frames_1 );

-  assert ( old_n_frames_3 == (uint_t)floor(old_n_frames_1 / 2. + .5) );

+  // check that we got about half the frames, with 3 decimals

+  assert ( roundf(1.e3 * old_n_frames_1 / old_n_frames_3) / 1.e3 == 2.);

   return err;

 }