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mathutils.c: fix invalid read in vec_moving_thres

--- a/src/mathutils.c

+++ b/src/mathutils.c

@@ -226,9 +226,9 @@

       medar[k] = vec->data[0][k+pos-post];

   /* pre part of the buffer does not exist */

   } else {

-    for (k=0;k<length-pos+post+1;k++)

+    for (k=0;k<length-pos+post;k++)

       medar[k] = vec->data[0][k+pos-post];

-    for (k=length-pos+post+1;k<win_length;k++)

+    for (k=length-pos+post;k<win_length;k++)

       medar[k] = 0.; /* 0-padding at the end */

   }

   return vec_median(tmpvec);