[ruby-cvs:55462] hone:r48312 (trunk): fix typo, NUL -> NULL

[hone at ruby-lang.org]

hone	2014-11-07 12:09:28 +0900 (Fri, 07 Nov 2014)

  New Revision: 48312

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=48312

  Log:
    fix typo, NUL -> NULL

  Modified files:
    trunk/ChangeLog