table: do not rely on undefined behavior in cleanup_sstables
table: do not rely on undefined behavior in cleanup_sstables

It shouldn't rely on argument evaluation order, which is ub.

Fixes #4718.

Signed-off-by: Raphael S. Carvalho <1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@scylladb.com>

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