Description: sch_sfb: Don't assume the skb is still around after enqueueing to child
References:
 https://lore.kernel.org/all/87wnao2ha3.fsf@toke.dk/T/
 https://bugzilla.redhat.com/show_bug.cgi?id=2124475
Notes:
Bugs:
upstream: released (6.0-rc5) [9efd23297cca530bb35e1848665805d3fcdd7889]
5.10-upstream-stable: released (5.10.143) [2ee85ac1b29dbd2ebd2d8e5ac1dd5793235d516b]
4.19-upstream-stable: released (4.19.258) [9245ed20950afe225bc6d1c4b9d28d55aa152e25]
sid: released (5.19.11-1)
5.10-bullseye-security: released (5.10.148-1)
4.19-buster-security: released (4.19.260-1)