rps: flow_dissector: Add the const for the parameter of flow_keys_have_l4

Add the const for the parameter of flow_keys_have_l4 for the readability.

Signed-off-by: Gao Feng <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/flow_dissector.h

···
 void make_flow_keys_digest(struct flow_keys_digest *digest,
 			   const struct flow_keys *flow);
 
-static inline bool flow_keys_have_l4(struct flow_keys *keys)
+static inline bool flow_keys_have_l4(const struct flow_keys *keys)
 {
 	return (keys->ports.ports || keys->tags.flow_label);
 }