remove memset when freeing

src/cats/plants/plant_structures.c

@@ -106,13 +106,14 @@ void destroy_juveniles(const struct cats_grid *grid, const cats_dt_coord row, co
         assert(row >= 0 && row < grid->dimension.rows);
         assert(col >= 0 && col < grid->dimension.cols);
         assert(grid->juveniles != NULL);
+
+
         const int32_t max_age_of_maturity = get_vital_age(grid, VA_AGE_OF_MATURITY_MAX);
 
         const int32_t stages = max_age_of_maturity + 1;
         assert(stages >= 0);
 
-        if (grid->juveniles[row][col]) {
-                memset(grid->juveniles[row][col], 0, stages * sizeof(cats_dt_population));
+        if (grid->juveniles[row] && grid->juveniles[row][col]) {
                 free(grid->juveniles[row][col]);
                 grid->juveniles[row][col] = NULL;
         }