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file.c: call get_stat only once

• file.c (rb_stat_wr, rb_stat_ww): call get_stat only once and
  reduce checking struct. patch by Yuki Kurihara in
  [ruby-core:71949]. [Misc #11789]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52970 b2dd03c8-39d4-4d8f-98ff-823fe69b080e