sis190: failure to set the MAC address from EEPROM

Fix from http://bugzilla.kernel.org/show_bug.cgi?id=7747



Signed-off-by: Andrew Morton <akpm@osdl.org>
Cc: <sleepy@mike-neko.net>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>