eval.c: clear internal errinfo

	* eval.c (ruby_cleanup): clear internal error info when invoking
	  end procs.  [ruby-core:91731] [Bug #15650]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67209 b2dd03c8-39d4-4d8f-98ff-823fe69b080e