Lib: use amqp_hostcheck correctly

Use amqp_hostcheck instead of strcasecmp, and pass in the correct arguments in the right order in both SAN and CN codepaths.

Author: alanxz

librabbitmq/amqp_openssl_hostname_validation.c

@@ -79,7 +79,7 @@ static amqp_hostname_validation_result amqp_matches_common_name(
  }
 
  // Compare expected hostname with the CN
- if (strcasecmp(hostname, common_name_str) == 0) {
+ if (amqp_hostcheck(common_name_str, hostname) == AMQP_HCR_MATCH) {
  return AMQP_HVR_MATCH_FOUND;
  } else {
  return AMQP_HVR_MATCH_NOT_FOUND;
@@ -126,7 +126,7 @@ static amqp_hostname_validation_result amqp_matches_subject_alternative_name(
  result = AMQP_HVR_MALFORMED_CERTIFICATE;
  break;
  } else { // Compare expected hostname with the DNS name
- if (amqp_hostcheck(hostname, dns_name) == 0) {
+ if (amqp_hostcheck(dns_name, hostname) == AMQP_HCR_MATCH) {
  result = AMQP_HVR_MATCH_FOUND;
  break;
  }