streaming: Do not reveal raw pointer in info message
streaming: Do not reveal raw pointer in info message

Showing raw pointer values in logs is not considered to be good
practice. However, for debugging/tracing this might be helpful.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

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