Remove reachable call to pg_unreachable().
The loop just before this uses break, not return, so this line
is reachable. Commit
cafe1056558fe07cdc52b95205588fcd80870362
introduced this issue.
Jelte Fennema-Nio, reviewed by Tristan Partin
Discussion: http://postgr.es/m/CAGECzQTO72jKed5461W8cytV2Msh_e+WUZjOyX_RUQCbjk4LRA@mail.gmail.com