net: dsa: mv88e6xxx: write MAC outside of ATU Get Next code

There is no need to write the MAC address before every Get Next
operation, since ATU MAC registers are not cleared between calls.

Move the _mv88e6xxx_atu_mac_write call outside of _mv88e6xxx_atu_getnext
so future code could call ATU Get Next multiple times and save a few
register access.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx.c

@@ -1751,7 +1751,6 @@ int mv88e6xxx_port_fdb_del(struct dsa_switch *ds, int port,
 }
 
 static int _mv88e6xxx_atu_getnext(struct dsa_switch *ds, u16 fid,
-				  const unsigned char *addr,
 				  struct mv88e6xxx_atu_entry *entry)
 {
 	struct mv88e6xxx_atu_entry next = { 0 };
@@ -1763,10 +1762,6 @@ static int _mv88e6xxx_atu_getnext(struct dsa_switch *ds, u16 fid,
 	if (ret < 0)
 		return ret;
 
-	ret = _mv88e6xxx_atu_mac_write(ds, addr);
-	if (ret < 0)
-		return ret;
-
 	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_FID, fid);
 	if (ret < 0)
 		return ret;
@@ -1827,7 +1822,11 @@ int mv88e6xxx_port_fdb_getnext(struct dsa_switch *ds, int port,
 			fid = vtu.fid;
 		}
 
-		ret = _mv88e6xxx_atu_getnext(ds, fid, addr, &next);
+		ret = _mv88e6xxx_atu_mac_write(ds, addr);
+		if (ret < 0)
+			goto unlock;
+
+		ret = _mv88e6xxx_atu_getnext(ds, fid, &next);
 		if (ret < 0)
 			goto unlock;