PVS-Studio warning V595 for Asterisk

static void sorcery_object_wizard_destructor(void *obj)
{
  struct ast_sorcery_object_wizard *object_wizard = obj;

  if (object_wizard->data) {
    object_wizard->wizard->close(object_wizard->data);      //<==
  }

  if (object_wizard->wizard) {                              //<==
    ast_module_unref(object_wizard->wizard->module);
  }

  ao2_cleanup(object_wizard->wizard);                       //<==
}

This suspicious code was found in Asterisk project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'object_wizard->wizard' pointer was utilized before it was verified against nullptr. Check lines: 683, 686. sorcery.c 683

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/