2b40f405f0
Fixes #20633
Cannot assert on actual request_controller when releasing permit, as the
release, if we have waiters in queue, will subtract some units to hand to them.
Instead assert on permit size + waiter status (and if zero, also controller value)
* v2 - use SCYLLA_ASSERT
(cherry picked from commit 58087ef427)
Closes scylladb/scylladb#22455