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[io] sink_wavwrite_do writes all to channels if more than one

--- a/src/io/sink_wavwrite.c

+++ b/src/io/sink_wavwrite.c

@@ -233,7 +233,7 @@

 void aubio_sink_wavwrite_do(aubio_sink_wavwrite_t *s, fvec_t * write_data, uint_t write){

-  uint_t i = 0, written_frames = 0;

+  uint_t c = 0, i = 0, written_frames = 0;

   if (write > s->max_size) {

     AUBIO_WRN("sink_wavwrite: trying to write %d frames to %s, "

@@ -241,10 +241,12 @@

     write = s->max_size;

   }

-  for (i = 0; i < write; i++) {

-    s->scratch_data[i] = HTOLES(FLOAT_TO_SHORT(write_data->data[i]));

+  for (c = 0; c < s->channels; c++) {

+    for (i = 0; i < write; i++) {

+      s->scratch_data[i * s->channels + c] = HTOLES(FLOAT_TO_SHORT(write_data->data[i]));

+    }

   }

-  written_frames = fwrite(s->scratch_data, 2, write, s->fid);

+  written_frames = fwrite(s->scratch_data, 2, write * s->channels, s->fid);

   if (written_frames != write) {

     AUBIO_WRN("sink_wavwrite: trying to write %d frames to %s, "