Ruby

tkutil.c: fix overrun

• ext/tk/tkutil/tkutil.c (cbsubst_initialize): fix out-of-bound
  access when no arguments given. p Tk::Event.new crashed.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54509 b2dd03c8-39d4-4d8f-98ff-823fe69b080e