This one is pretty simple
```
return do_with(std::move(data), [] {
toss_data(data);
return remove(std::move(data));
});
```
it doesn't really need to do_with() since "toss_data" is non-preemptive. Still, convert it into
```
toss_data(data);
co_await remove(std::move(data));
```
Closesscylladb/scylladb#20479
* github.com:scylladb/scylladb:
sstables: Restore indentation after previous patch
sstables: Coroutinize remove_unshared_sstables()
64ed3f80c7