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[utils] hist with size null fails

--- a/src/utils/hist.c

+++ b/src/utils/hist.c

@@ -43,6 +43,9 @@

   smpl_t step = (fhig-flow)/(smpl_t)(nelems);

   smpl_t accum = step;

   uint_t i;

+  if ((sint_t)nelems <= 0) {

+    return NULL;

+  }

   s->nelems = nelems;

   s->hist = new_fvec(nelems);

   s->cent = new_fvec(nelems);