e1000e: check_polarity function pointers not set for 8257x

The function pointers for 8257x devices are not set.  This is not really a
problem now because there is nothing in the driver that references the
pointers for this particular MAC-family (the appropriate functions are
called directly), but the pointers should be set in case they are used in
the future.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/e1000e/es2lan.c b/drivers/net/e1000e/es2lan.c
index c7bc657..d2a1047 100644
--- a/drivers/net/e1000e/es2lan.c
+++ b/drivers/net/e1000e/es2lan.c
@@ -1391,6 +1391,7 @@
 
 static struct e1000_phy_operations es2_phy_ops = {
 	.acquire		= e1000_acquire_phy_80003es2lan,
+	.check_polarity		= e1000_check_polarity_m88,
 	.check_reset_block	= e1000e_check_reset_block_generic,
 	.commit		 	= e1000e_phy_sw_reset,
 	.force_speed_duplex 	= e1000_phy_force_speed_duplex_80003es2lan,