moderately clean handling of allocated storage on error during partial

construction, in spite of not having exception handling in the language.

	* krb5_decode.c (clean_krb5_authenticator, clean_krb5_ticket,
	clean_krb5_enc_tkt_part,clean_krb5_ap_req,
	clean_krb5_ap_rep_enc_part, clean_krb5_safe,
	clean_krb5_priv_enc_part, clean_krb5_cred_enc_part,
	clean_krb5_error): new static functions to free objects that may
	be partially constructed.
	(setup_buf_only, setup_no_tagnum, setup_no_length, setup): define
	in terms of each other to remove duplication, then add local
	variable error_cleanup to common declarations.
	(clean_return): new macro, uses error_cleanup on rep if possible
	and the allows the argument to be returned.
	(alloc_field, check_apptag, next_tag, begin_structure,
	get_field_body, get_field, get_lenfield_body, get_lenfield): use
	clean_return.
	(free_field): new macro to simplify the writing of clean_*.
	(clear_field): macro to clean up preparation of fields for later
	use by clean_* functions.
	(decode_krb5_authenticator, decode_krb5_ticket,
	decode_krb5_encryption_key, decode_krb5_enc_tkt_part,
	decode_krb5_enc_kdc_rep_part, decode_krb5_as_rep,
	decode_krb5_tgs_rep, decode_krb5_ap_req, decode_krb5_ap_rep,
	decode_krb5_ap_rep_enc_part, decode_krb5_as_req,
	decode_krb5_tgs_req, decode_krb5_kdc_req_body, decode_krb5_safe,
	decode_krb5_priv, decode_krb5_enc_priv_part, decode_krb5_cred,
	decode_krb5_enc_cred_part, decode_krb5_error,
	decode_krb5_authdata, decode_krb5_pwd_sequence,
	decode_krb5_pwd_data, decode_krb5_padata_sequence,
	decode_krb5_alt_method, decode_krb5_etype_info): change setup
	macro to pass a cleanup method (or just free if there were no
	partial allocations, or 0 for the two cases with no allocation at
	all.) Also explicitly zero pointer subfields, since calloc is not
	a safe way to assure that. Generally, provide for automatic
	deallocation of storage on error.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@6785 dc483132-0cff-0310-8789-dd5450dbe970

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