net: refactor netdev_rx_queue_restart() to use local qops

Shorten the lines by storing dev->queue_mgmt_ops in a temp variable.

Reviewed-by: Mina Almasry <almasrymina@google.com>
Link: https://patch.msgid.link/20250206225638.1387810-2-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>