The dns_rrl function's return type, dns_rrl_result_t, is an enumerated
type defined in file lib/dns/include/dns/rrl.h, before the result code
API update, the previous returning of ISC_R_SUCCESS within this function
was compatible with DNS_RRL_RESULT_OK, both had the same value of zero.
After the refactor of the result code API, this is no more true, these
result codes hold different values, besides, the correct result code to
use within this function is DNS_RRL_RESULT_OK and not ISC_R_SUCCESS.
Diego Fronza
c2ff51150f