* lib/minitest/mock.rb: Remove unused variable warnings.

Patch by Run Paint [ruby-core:30991]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29721 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/minitest/mock.rb

@@ -14,7 +14,7 @@ module MiniTest
     end
 
     def expect(name, retval, args=[])
-      n, r, a = name, retval, args # for the closure below
+      n, r = name, retval # for the closure below
       @expected_calls[name] = { :retval => retval, :args => args }
       self.class.__send__ :remove_method, name if respond_to? name
       self.class.__send__(:define_method, name) { |*x|