Description:  net/sched: cbs: Fix not adding cbs instance to list
References:
Notes:
 carnil> Commit fixes e0a7683d30e9 ("net/sched: cbs: fix port_rate
 carnil> miscalculation") in 5.2-rc1 (and backported to 4.19.99)
Bugs:
upstream: released (5.4-rc1) [3e8b9bfa110896f95d602d8c98d5f9d67e41d78c]
6.1-upstream-stable: N/A "Fixed before branching point"
5.10-upstream-stable: N/A "Fixed before branching point"
4.19-upstream-stable: released (4.19.307)
sid: released (5.3.7-1)
6.1-bookworm-security: N/A "Fixed before branching point"
5.10-bullseye-security: N/A "Fixed before branching point"
4.19-buster-security: pending (4.19.309-1)