msxml3/mxwriter: Use 4K for internal buffer size.

dlls/msxml3/mxwriter.c

 /*
  *    MXWriter implementation
  *
- * Copyright 2011-2014 Nikolay Sivov for CodeWeavers
+ * Copyright 2011-2014, 2016 Nikolay Sivov for CodeWeavers
  * Copyright 2011 Thomas Mullaly
  *
  * This library is free software; you can redistribute it and/or
@@ -244,7 +244,7 @@ static xml_encoding parse_encoding_name(const WCHAR *encoding)
 
 static HRESULT init_encoded_buffer(encoded_buffer *buffer)
 {
-    const int initial_len = 0x2000;
+    const int initial_len = 0x1000;
     buffer->data = heap_alloc(initial_len);
     if (!buffer->data) return E_OUTOFMEMORY;
 

dlls/msxml3/tests/saxreader.c

@@ -3305,7 +3305,6 @@ static void test_mxwriter_flush(void)
     pos2.QuadPart = 0;
     hr = IStream_Seek(stream, pos, STREAM_SEEK_CUR, &pos2);
     EXPECT_HR(hr, S_OK);
-todo_wine
     ok(pos2.QuadPart != 0, "unexpected stream beginning\n");
 
     hr = IMXWriter_get_output(writer, NULL);