* dwarf2read.c (open_and_init_dwp_file): Remove incorrect, and
	unnecessary, cleanup.
	* dwarf2read.c (open_dwo_file): Renamed from open_dwop_file.
	Delete arg is_dwp.  All callers updated.
	(open_dwp_file): New function.
	(open_and_init_dwp_file): Call it.
	(get_dwp_file): New function.
	(lookup_dwo_cutu): Call it.