bnx2x: ethtool returns req. AN even when AN fails

Previously, if autoneg failed, ethtool would return the achieved autoneg.
This patch corrects this, causing ethtool to return the requested autoneg
capabilities even if autoneg fails.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>