net: dsa: dsa_bridge_mtu_normalization() can be static

Fixes: f41071407c85 ("net: dsa: implement auto-normalization of MTU for bridge hardware datapath")
Signed-off-by: Nkbuild test robot <lkp@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/dsa/slave.c

@@ -1338,7 +1338,7 @@ static void dsa_hw_port_list_free(struct list_head *hw_port_list)
 }
 
 /* Make the hardware datapath to/from @dev limited to a common MTU */
-void dsa_bridge_mtu_normalization(struct dsa_port *dp)
+static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
 {
 	struct list_head hw_port_list;
 	struct dsa_switch_tree *dst;