mt76: use cancel_delayed_work_sync in mt76_rx_aggr_shutdown

The workqueue item needs to be fully shut down before the struct can be
freed.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2019-09-15 18:43:59 +02:00
commit b0b2373db7