Mark deadcode for gcov

sql/ha_heap.cc

@@ -129,8 +129,8 @@ handler *ha_heap::clone(MEM_ROOT *mem_root)
   handler *new_handler= get_new_handler(table, mem_root, table->s->db_type);
   if (new_handler && !new_handler->ha_open(file->s->name, table->db_stat,
                                            HA_OPEN_IGNORE_IF_LOCKED))
-    return new_handler; /* purecov: inspected */
-  return NULL;
+    return new_handler;
+  return NULL;  /* purecov: inspected */
 }