staging: et131x: remove calls to netif_carrier_[on|off] from et131x_mii_check

As et131x_adjust_link is called from the phydev in response to a netif_carrier_[on|off], and is the only caller of et131x_mii_check, we don't need to call netif_carrier_[on|off] again.

Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>