test: fix SetLastError's input type

Author: kou

test/fiddle/test_function.rb

@@ -101,7 +101,7 @@ def test_last_error
     if WINDOWS
       def test_win32_last_error
         kernel32 = Fiddle.dlopen("kernel32")
-        args = [kernel32["SetLastError"], [TYPE_LONG], TYPE_VOID]
+        args = [kernel32["SetLastError"], [-TYPE_LONG], TYPE_VOID]
         args << Function::STDCALL if Function.const_defined?(:STDCALL)
         set_last_error = Function.new(*args)
         assert_nil(Fiddle.win32_last_error)