fixes minor potential issue in routine yac_new_interpolation_method_nnn_mask

src/interpolation_method_nnn.c

@@ -1224,12 +1224,13 @@ yac_new_interpolation_method_nnn_mask(struct global_search * search,
       str_buf_size += strlen(target_comp_name);
       str_buf_size += strlen(source_domain_name);
       str_buf_size += strlen(target_domain_name);
-      str_buf_size += strlen(stack_name) + 10 + 10 + 10 + 2 + 16 + 10 + 1;
+      str_buf_size += strlen(stack_name) + 10 + 10 + 10 + 2 + 16 + 16 + 10 + 1;
          // (+ 10) for points_idx
          // (+ 10) for reduction_type
          // (+ 10) for n
          // (+ 2)  for mask handling
          // (+ 16) for rbf scale
+         // (+ 16) for gauss scale
          // (+ 10) for unique_method_id
          // (+ 1)  for '\0'