tests/lsa: do not leak memory in large allocation test
tests/lsa: do not leak memory in large allocation test

Large allocations test, unsurprisingly, allocates a lot of memory. Do
not leak it so that any tests that are going to be run afterwards have
still some memory left.

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

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