In TCP, connect() can return incorrect error code EINVAL
instead of EADDRINUSE or ECONNREFUSED

PR:                         [[ https://bugs.freebsd.org/196035 | 196035 ]]
Differential Revision:      https://reviews.freebsd.org/D1982
Reported by:                Mark Nunberg <mnunberg@haskalah.org>
Submitted by:               Harrison Grundy <harrison.grundy@astrodoggroup.com>
Reviewed by:                adrian, jch, glebius, gnn
Approved by:                jhb