* ext/win32ole/win32ole_event.c(ev_advise, ole_event_free,
  fev_s_allocate, fev_unadvise): avoid segmentation fault when COM
  server freed before calling Unadvise from WIN32OLE_EVENT object.
* ext/win32ole/win32ole.c: ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47570 b2dd03c8-39d4-4d8f-98ff-823fe69b080e