To prevent use-after-free as seen in
https://github.com/scylladb/scylladb/issues/15097
where a temp schema_ptr retrieved from a global_schema_ptr
get destroyed when the notification function yielded.
Capturing the schema_ptr on the coroutine frame
is inexpensive since its a shared ptr and it makes sure
that the schema remains valid throughput the coroutine
life time.
Fixes scylladb/scylladb#15097
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Closes#15098
0f54e24519