kdc_preauth.c (check_padata): Fixed error handling; in order for

kdc_preauth.c (check_padata): Fixed error handling; in order for
	check_preauth to return successfully, there must be at least one
	preauth which succeeded, and no REQUIRED preauth system which failed.
	If a preauth is marked SUFFICIENT, then the rest of the preauth list
	aren't checked.  Fixed bug where when none of the preauth types were
	recognized, an error message corresponding to stack garbage was
	printed.

main.c (argv): Check the error return from krb5_init_context(), and
	print an error message if necessary.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@9323 dc483132-0cff-0310-8789-dd5450dbe970