* iseq.c (iseq_data_to_ary): fix condition.
  r34303 introduces a bug to avoid all line information from
  a result of ISeq#to_a. This is a regression problem from 2.0.0p0.
* test/ruby/test_iseq.rb: add a test of lines after ISeq#to_a.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39536 b2dd03c8-39d4-4d8f-98ff-823fe69b080e