The `switch (n_rear)` supports up to 5 rear channels, but our channel set only had space for 3. Size the set properly to fix this. This didn't actually cause any memory unsafety as `PUSH_CHAN` would stop incrementing `n_rear` if the channel set is already full. Thanks to @alatiera for noticing this. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4712>