igb: Avoid uninitialized advertised variable in eee_set_cur

eee_get_cur assumes that the output data is already zeroed. It can
read-modify-write the advertised field:

if (ipcnfg & E1000_IPCNFG_EEE_100M_AN)
2594 edata->advertised |= ADVERTISED_100baseT_Full;

This is ok for the normal ethtool eee_get call, which always
zeroes the input data before.

But eee_set_cur also calls eee_get_cur and it did not zero the input
field. Later on it then compares agsinst the field, which can contain partial
stack garbage.

Zero the input field in eee_set_cur() too.

Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Andi Kleen <[e-mail]>
Acked-by: Jeff Kirsher <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/intel/igb/igb_ethtool.c

···
 	    (hw->phy.media_type != e1000_media_type_copper))
 		return -EOPNOTSUPP;
 
+	memset(&eee_curr, 0, sizeof(struct ethtool_eee));
+
 	ret_val = igb_get_eee(netdev, &eee_curr);
 	if (ret_val)
 		return ret_val;