cxgb4: mark cxgb_setup_tc() static

We get 1 warning when building kernel with W=1:
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:2715:5: warning: no previous prototype for 'cxgb_setup_tc' [-Wmissing-prototypes]

In fact, this function is only used in the file in which it is
declared and don't need a declaration, but can be made static.
so this patch marks this function with 'static'.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

@@ -2712,7 +2712,7 @@ static int cxgb_set_tx_maxrate(struct net_device *dev, int index, u32 rate)
 	return err;
 }
 
-int cxgb_setup_tc(struct net_device *dev, u32 handle, __be16 proto,
+static int cxgb_setup_tc(struct net_device *dev, u32 handle, __be16 proto,
 			 struct tc_to_netdev *tc)
 {
 	struct port_info *pi = netdev2pinfo(dev);