* io.c (rb_io_eof): use eof() instead of io_fillbuf(). It's because
io_unread() doesn't work properly when reading CRLF with read(length)
and mode 'r'.
[ruby-core:44189][Bug #6271]
* test/ruby/test_io_m17n.rb (TestIO_M17N#test_read_crlf_and_eof):
test for above.
merge revision(s) 35296: [Backport #6295]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@35331 b2dd03c8-39d4-4d8f-98ff-823fe69b080e