net: mvpp2: cls: Remove set but not used variable 'act'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c: In function 'mvpp2_cls_c2_build_match':
drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c:1159:28: warning:
 variable 'act' set but not used [-Wunused-but-set-variable]

It is never used since introduction in
commit 90b509b3 ("net: mvpp2: cls: Add Classification offload support")
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c

@@ -1156,11 +1156,8 @@ static int mvpp2_port_flt_rfs_rule_insert(struct mvpp2_port *port,
 static int mvpp2_cls_c2_build_match(struct mvpp2_rfs_rule *rule)
 {
 	struct flow_rule *flow = rule->flow;
-	struct flow_action_entry *act;
 	int offs = 64;
 
-	act = &flow->action.entries[0];
-
 	if (flow_rule_match_key(flow, FLOW_DISSECTOR_KEY_PORTS)) {
 		struct flow_match_ports match;