net: sched: Fix a possible null-pointer dereference in dequeue_func() [Linux 4.9.189]

This Linux kernel change "net: sched: Fix a possible null-pointer dereference in dequeue_func()" is included in the Linux 4.9.189 release. This change is authored by Jia-Ju Bai <baijiaju1990 [at] gmail.com> on Mon Jul 29 16:24:33 2019 +0800. The commit for this change in Linux stable tree is 4c6f0d6 (patch) which is from upstream commit 051c7b3. […]