* dirmngr/dns.h (dns_strsection, dns_strclass)
(dns_strtype): Change APIs.
* dirmngr/dns.c (dns_p_lines): Use __dst for dns_strsection.
(dns_rr_print): Use __dst for dns_strclass and dns_strtype.
(dns_trace_dump): Likewise.
(dns_ai_print): Use __dst for dns_strtype.
(dns_strsection): Add an argument __dst for storage.
(dns_strclass, dns_strtype): Likewise.
(parse_packet): Use __dst for dns_strsection.
(send_query): Use __dst for dns_strtype.
(isection): Use __dst for dns_strsection.
(iclass): Use __dst for dns_strclass.
(itype): Use __dst for dns_strtype.
GnuPG-bug-id: 4934
Reported-by: Tomas Mraz
Fixes-commit: 455ef62d29a112de05897139716265d07e4c6ae3
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>