Bug 1428852 - Crash reporter leaks file handle r=gsvelto

MozReview-Commit-ID: IXeI73FipZv

--HG--
extra : rebase_source : abc29a4efc72c4400c97605da24798d1d7c124df

toolkit/crashreporter/client/crashreporter_win.cpp

@@ -1566,6 +1566,7 @@ void UIPruneSavedDumps(const std::string& directory)
 
     dumpfiles.pop_back();
   }
+  FindClose(dirlist);
 }
 
 bool UIRunProgram(const string& exename,