Staging: et131x: unify return value of .ndo_set_mac_address if address is invalid

Unify return value of .ndo_set_mac_address if the given address
isn't valid. Return -EADDRNOTAVAIL as eth_mac_addr() already does
if is_valid_ether_addr() fails.

Signed-off-by: Danny Kukawka <danny.kukawka@bisect.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c
index fafc9fb..3f919ba 100644
--- a/drivers/staging/et131x/et131x.c
+++ b/drivers/staging/et131x/et131x.c
@@ -5177,7 +5177,7 @@
 
 	/* Make sure the requested MAC is valid */
 	if (!is_valid_ether_addr(address->sa_data))
-		return -EINVAL;
+		return -EADDRNOTAVAIL;
 
 	et131x_disable_txrx(netdev);
 	et131x_handle_send_interrupt(adapter);