[GX] Skip tail zero entries when setting variation coordinates

src/hb-font.cc

@@ -1556,6 +1556,10 @@ hb_font_set_var_coords_normalized (hb_font_t *font,
   if (font->immutable)
     return;
 
+  /* Skip tail zero entries. */
+  while (coords_length && !coords[coords_length - 1])
+    coords_length--;
+
   int *copy = (int *) calloc (coords_length, sizeof (coords[0]));
   if (unlikely (!copy))
     return;