net: sch: api: add extack support in qdisc_get_rtab
This patch adds extack support for the function qdisc_get_rtab which is a common used function in the tc subsystem. Callers which are interested in the receiving error can assign extack to get a more detailed information why qdisc_get_rtab failed. Cc: David Ahern <dsahern@gmail.com> Acked-by: NJamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: NAlexander Aring <aring@mojatatu.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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