test_fileutils.rb: fix for Mac OS X

* test/fileutils/test_fileutils.rb (test_chown_error): fix for Mac
  OS X, whose getpwnam("") doesn't err.  passwd & group databases
  format is colon-separated, so user & group name can't contain a
  colon.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44399 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
file.c: proper types

* file.c (rb_file_chown): use proper configured types, not plain
  int.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44400 b2dd03c8-39d4-4d8f-98ff-823fe69b080e