corrupted strings of GtkFileChooser by outputting with libxml2

[Joël Krähemann <joel weedlight ch>]

Why do I get corrupted strings of GtkFileChooser when using it with
libxml2.

please take a look at sf.net/p/ags

> ==22743== 1 errors in context 1 of 15:
> ==22743== Invalid read of size 8
> ==22743==    at 0x3EE9E89DEF: __GI_mempcpy (in /usr/lib64/libc-2.17.so)
> ==22743==    by 0x3EE9E79408: _IO_default_xsputn (in /usr/lib64/libc-2.17.so)
> ==22743==    by 0x3EE9E48DB1: vfprintf (in /usr/lib64/libc-2.17.so)
> ==22743==    by 0x3EE9F0D024: __vasprintf_chk (in /usr/lib64/libc-2.17.so)
> ==22743==    by 0x3EEBE8694B: g_vasprintf (in /usr/lib64/libglib-2.0.so.0.3600.4)
> ==22743==    by 0x3EEBE64C6F: g_strdup_vprintf (in /usr/lib64/libglib-2.0.so.0.3600.4)
> ==22743==    by 0x3EEBE64D0B: g_strdup_printf (in /usr/lib64/libglib-2.0.so.0.3600.4)
> ==22743==    by 0x443A5D: ags_file_write_file_link (ags_file_util.c:1240)
> ==22743==    by 0x445CD0: ags_file_write_input (ags_file_sound.c:1526)
> ==22743==    by 0x44C8A1: ags_file_write_channel (ags_file_sound.c:1352)
> ==22743==    by 0x44CF9D: ags_file_write_audio (ags_file_sound.c:904)
> ==22743==    by 0x44D10F: ags_file_write_audio_list (ags_file_sound.c:1030)
> ==22743==  Address 0x1d208340 is 32 bytes inside a block of size 64 free'd
> ==22743==    at 0x4A074C4: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==22743==    by 0x3EEBE4D93E: g_free (in /usr/lib64/libglib-2.0.so.0.3600.4)
> ==22743==    by 0x3EED6D9B2D: ??? (in /usr/lib64/libgio-2.0.so.0.3600.4)
> ==22743==    by 0x3EF9AFA024: ??? (in /usr/lib64/libgtk-x11-2.0.so.0.2400.22)
> ==22743==    by 0x3EED6492C6: ??? (in /usr/lib64/libgio-2.0.so.0.3600.4)
> ==22743==    by 0x3EED6778BA: ??? (in /usr/lib64/libgio-2.0.so.0.3600.4)
> ==22743==    by 0x3EED6778D8: ??? (in /usr/lib64/libgio-2.0.so.0.3600.4)
> ==22743==    by 0x3EEBE47DC5: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.3600.4)
> ==22743==    by 0x3EEBE48117: ??? (in /usr/lib64/libglib-2.0.so.0.3600.4)
> ==22743==    by 0x3EEBE48519: g_main_loop_run (in /usr/lib64/libglib-2.0.so.0.3600.4)
> ==22743==    by 0x3EF9ABF58D: gtk_dialog_run (in /usr/lib64/libgtk-x11-2.0.so.0.2400.22)
> ==22743==    by 0x498043: ags_menu_bar_save_as_callback (ags_menu_bar_callbacks.c:162)

regards