sfc: Don't use enums as a bitmask.

This fixes:

drivers/net/sfc/mcdi_mac.c: In function ‘efx_mcdi_set_mac’:
drivers/net/sfc/mcdi_mac.c:36:2: warning: case value ‘3’ not in enumerated type ‘enum efx_fc_type’

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sfc/mdio_10g.c b/drivers/net/sfc/mdio_10g.c
index 7115914..7ab385c 100644
--- a/drivers/net/sfc/mdio_10g.c
+++ b/drivers/net/sfc/mdio_10g.c
@@ -284,7 +284,7 @@
 	efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
 }
 
-enum efx_fc_type efx_mdio_get_pause(struct efx_nic *efx)
+u8 efx_mdio_get_pause(struct efx_nic *efx)
 {
 	BUILD_BUG_ON(EFX_FC_AUTO & (EFX_FC_RX | EFX_FC_TX));