ensure the head entry of addrinfo chain has non-NULL ai_canonname to be compliant with RFC3493.
ensure the head entry of addrinfo chain has non-NULL ai_canonname to be
compliant with RFC3493.

PR: standards/114910
Approved by:   ume (mentor)
Approved by:   re
MFC after:     1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase