increment @tmp_count.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36451 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_argf.rb

@@ -31,6 +31,7 @@ class TestArgf < Test::Unit::TestCase
   end
 
   def make_tempfile0(basename)
+    @tmp_count += 1
     open("#{@tmpdir}/#{basename}-#{@tmp_count}", "w")
   end