lsa: free segment in trim_emergency_reserve_to_max()
lsa: free segment in trim_emergency_reserve_to_max()

_emergency_reserve is an intrusive containers and it doesn't care about
segment lifetime.

Signed-off-by: Paweł Dziepak <e29bb3265626c60caf76d587cabdfcd8b379ef80@scylladb.com>

kjniemi/scylla,avikivity/scylla,scylladb/scylla,duarten/scylla,raphaelsc/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,duarten/scylla,scylladb/scylla,avikivity/scylla,kjniemi/scylla,raphaelsc/scylla,kjniemi/scylla,raphaelsc/scylla,duarten/scylla