tests: Fix use after free in check_multi_schema
tests: Fix use after free in check_multi_schema

Refs #4376

Signed-off-by: Piotr Jastrzebski <2c0eb4a25a7cde333ff2d0860cb06051925fd74f@scylladb.com>
Message-Id: <7d7b4cf69cea1e4d31058d8f1fd2c01f1dd11c58.1554387442.git.2c0eb4a25a7cde333ff2d0860cb06051925fd74f@scylladb.com>

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