Building with the attached random configuration file,
net/sched/cls_flower.c: In function ‘fl_set_key’:
net/sched/cls_flower.c:240:3: error: implicit declaration of function
‘tcf_change_indev’ [-Werror=implicit-function-declaration]
err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
^