* coffread.c (coff_symfile_read): Make a cleanup for 'debugfile'

	* coffread.c (coff_symfile_read): Make a cleanup for 'debugfile'
	and 'abfd'.
	* elfread.c (elf_symfile_read): Make a cleanup for 'debugfile'
	and 'abfd'.
	* jit.c (jit_bfd_try_read_symtab): Make a cleanup for 'nbfd'.
	* machoread.c (macho_add_oso_symfile): Make a cleanup for
	'abfd'.
	(macho_symfile_read): Make a cleanup for 'dsym_bfd'.
	* objfiles.c (allocate_objfile): Acquire a new reference.
	* rs6000-nat.c (add_vmap): Don't acquire a BFD reference.
	* solib.c (solib_read_symbols): Don't acquire a BFD reference.
	* spu-linux-nat.c (spu_symbol_file_add_from_memory): Make
	a cleanup for 'nbfd'.
	* symfile-mem.c (symbol_file_add_from_memory): Make a cleanup
	for 'nbfd'.
	* symfile.c (symbol_file_add_with_addrs_or_offsets): Don't
	make a cleanup for 'abfd'.
	(symbol_file_add): Make a BFD cleanup.