Fix control flow issues in zone.c
Since dns_master_dump() can no longer return DNS_R_CONTINUE, the error recovery code in zone_dump() had branches that could no longer be reached. This has been cleaned up.
Closes #3640 (closed)
Since dns_master_dump() can no longer return DNS_R_CONTINUE, the error recovery code in zone_dump() had branches that could no longer be reached. This has been cleaned up.
Closes #3640 (closed)