cql3: change sprint() of a pointer to use void* explicitly
cql3: change sprint() of a pointer to use void* explicitly

Otherwise, fmtlib dislikes it.

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