e1000e: normalize usage of serdes_has_link

Cosmetic change to use struct e1000_mac_info.serdes_has_link
consistently as the 'bool' that it's declared as.

No functional change.

Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Jeff Kirsher <Jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/e1000e/ethtool.c b/drivers/net/e1000e/ethtool.c
index e48956d..2557aee 100644
--- a/drivers/net/e1000e/ethtool.c
+++ b/drivers/net/e1000e/ethtool.c
@@ -1589,7 +1589,7 @@
 	*data = 0;
 	if (hw->phy.media_type == e1000_media_type_internal_serdes) {
 		int i = 0;
-		hw->mac.serdes_has_link = 0;
+		hw->mac.serdes_has_link = false;
 
 		/*
 		 * On some blade server designs, link establishment