Ignore empty volume labels; assume that GetVolumeInformation would fail if

Ignore empty volume labels; assume that GetVolumeInformation would fail if

2004-03-22  J. Ali Harlow  <ali@juiblex.co.uk>

	* gtk/gtkfilesystemwin32.c
	(gtk_file_system_win32_volume_get_display_name): Ignore empty
	volume labels; assume that GetVolumeInformation would fail if
	GetVolumeInformationW does; catches a small memory leak;
	pass the buffer size to GetVolumeInformationW in wide
	characters instead of bytes. Fixes bug #137543
	(list_volumes): Cope with the theoretical possibility of
	more than 26 logical drives. Fixes bug #137940
	(bookmarks_serialize): Now actually removes bookmarks.
	Fixes bug #137943