rem: return(frame.mii_data);
add: return frame.mii_data;
context: wb_miibus_readreg(wb_device *device, int phy, int reg){	struct wb_mii_frame frame;	memset(&frame, 0, sizeof(frame));	frame.mii_phyaddr = phy;	frame.mii_regaddr = reg;	wb_mii_readreg(device, &frame);	return(frame.mii_data);}