net/sched: act_pedit: remove extra check for key type

[ Upstream commit 57714018 ]

The netlink parsing already validates the key 'htype'.
Remove the datapath check as it's redundant.

Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 6c02568f ("net/sched: act_pedit: Parse L3 Header for L4 offset")
Signed-off-by: Sasha Levin <sashal@kernel.org>