openvswitch: Use sw_flow_key_range for key ranges.
These minor tidyups make a future patch a little tidier. Signed-off-by: Joe Stringer <joestringer@nicira.com> Acked-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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