openvswitch: Rename key_len to key_end

Key_end is a better name describing the ending boundary than key_len.
Rename those variables to make it less confusing.

Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index d08dcf7..e793051 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -243,7 +243,7 @@
 			   const struct ovs_key_ipv4_tunnel *output);
 
 bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
-		const struct sw_flow_key *key, int key_len);
+		const struct sw_flow_key *key, int key_end);
 
 struct sw_flow_mask {
 	int ref_count;