smbios: Normalize smbios_entry_add()'s error handling to exit(1) It exits on all error conditions but one, where it returns -1. Normalize, and return void. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>