Rename an argument name to avoid a potential clash.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3199 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/tempfile.rb

@@ -85,8 +85,8 @@ class Tempfile < SimpleDelegator
   #
   # If you don't explicitly unlink the temporary file, the removal
   # will be delayed until the object is finalized.
-  def close(unlink=false)
-    if unlink
+  def close(unlink_now=false)
+    if unlink_now
       close!
     else
       _close