Fix use-after-free in estimated_histogram parsing
Fix use-after-free in estimated_histogram parsing

A pointer to buf was used in do_until but buf wasn't
kept around and was destroyed.

Signed-off-by: Piotr Jastrzebski <2c0eb4a25a7cde333ff2d0860cb06051925fd74f@scylladb.com>

scylladb/scylla,avikivity/scylla,avikivity/scylla,avikivity/scylla,duarten/scylla,duarten/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla