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src/spectral/phasevoc.c: avoid unsigned < 0 comparison

--- a/src/spectral/phasevoc.c

+++ b/src/spectral/phasevoc.c

@@ -111,7 +111,8 @@

   /* less than 50% overlap, reset latest grain trail */

   else pv->start = win_s - hop_s - hop_s;

-  pv->end = MAX(0, win_s - hop_s);

+  if (win_s > hop_s) pv->end = win_s - hop_s;

+  else pv->end = 0;

   pv->end_datasize = pv->end * sizeof(smpl_t);

   pv->hop_datasize = pv->hop_s * sizeof(smpl_t);