CVE-2021-47125 sch_htb: fix refcount leak in htb_parent_to_leaf_offload

In the Linux kernel, the following vulnerability has been resolved: schhtb: fix refcount leak in htbparenttoleafoffload The commit ae81feb7338c "schhtb: fix null pointer dereference on a null newq" fixes a NULL pointer dereference bug, but it is not correct. Because htbgrafthelper properly handle...