Re: bfd_cleanup for object_p

More missing core file support changes.

	* aix386-core.c (aix386_core_file_p): Return bfd_cleanup.
	* aix5ppc-core.c (xcoff64_core_p): Likewise.
	* cisco-core.c (cisco_core_file_validate): Likewise.
	* hppabsd-core.c (hppabsd_core_core_file_p): Likewise.
	* hpux-core.c (hpux_core_core_file_p): Likewise.
	* irix-core.c (irix_core_core_file_p): Likewise.
	* lynx-core.c (lynx_core_file_p): Likewise.
	* netbsd-core.c (netbsd_core_file_p): Likewise.
	* osf-core.c (osf_core_core_file_p): Likewise.
	* ptrace-core.c (ptrace_unix_core_file_p): Likewise.
	* sco5-core.c (sco5_core_file_p): Likewise.