net: mii: report 0 for unknown lp_advertising

The newly introduced mii_ethtool_get_link_ksettings function sets
lp_advertising to an uninitialized value when BMCR_ANENABLE is not
set:

drivers/net/mii.c: In function 'mii_ethtool_get_link_ksettings':
drivers/net/mii.c:224:2: error: 'lp_advertising' may be used uninitialized in this function [-Werror=maybe-uninitialized]

As documented in include/uapi/linux/ethtool.h, the value is
expected to be zero when we don't know it, so let's initialize
it to that.

Fixes: bc8ee596af ("net: mii: add generic function to support ksetting support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mii.c

@@ -213,6 +213,8 @@ int mii_ethtool_get_link_ksettings(struct mii_if_info *mii,
 				    SPEED_100 : SPEED_10));
 		cmd->base.duplex = (bmcr & BMCR_FULLDPLX) ?
 			DUPLEX_FULL : DUPLEX_HALF;
+
+		lp_advertising = 0;
 	}
 
 	mii->full_duplex = cmd->base.duplex;