Use `&.` instead of modifier if

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63616 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/tool/extlibs.rb b/tool/extlibs.rb
index a840724794..94917a95a0 100755
--- a/tool/extlibs.rb
+++ b/tool/extlibs.rb
@@ -65,7 +65,7 @@ class ExtLibs
     when '.zip'
       pid = Process.spawn("unzip", inp, "-d", dir)
     end
-    f.close if f
+    f&.close
     Process.wait(pid)
     $?.success? or raise "failed to extract #{cache}"
   end