[ruby-cvs:60403] naruse:r53244 (trunk): fix r53231: raise Errno::EBADF like other OSes

[naruse at ruby-lang.org]

naruse	2015-12-22 22:45:14 +0900 (Tue, 22 Dec 2015)

  New Revision: 53244

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=53244

  Log:
    fix r53231: raise Errno::EBADF like other OSes

  Modified files:
    trunk/ext/socket/init.c