GSD-2021-1001505 net_sched: fix NULL deref in fifo_set_limit()

net_sched: fix NULL deref in fifo_set_limit() This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.9.287 by commit 08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4, it was introduced in version v2.6.27 by commit fb0305ce1b03f6ff17f84f2c63daccecb45f2805. For more details please see the references link