gnome_file_entry_get_full_path() can't deal with UTF-8 encoding filename.

Hi Guys,

Sorry for disturbance. I'm not sure what's right alias.

Here's the bug information.
http://bugzilla.gnome.org/show_bug.cgi?id=321144

Sometimes filename itself is in UTF-8 encoding. In this case, it's
unnecessary to invoke filename_from_utf8() when Glib encoding is
non-utf8 locale. Otherwise, the filename is displayed properly in file
chooser dialog, but the file actually can't be opened. This looks
contradictory.

Attached a patch for above, anyone can help me review?

Thanks,
-Simon