MFC r333329, r333366, r333373

r333329: Fix off-by-one error requesting tx interrupt
r333366: Cleanup queues when iflib_device_register fails
r333373: Log iflib_tx_structures_setup failure in function

Approved by: re (gjb@)
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D15354