Need to leave structure zeroed

src/drivers/bus/eisa.c

 	BUS_LOC_CHECK ( struct eisa_loc );
 	BUS_DEV_CHECK ( struct eisa_device );
 
-	return ( ++eisa_loc->slot & EISA_MAX_SLOT );
+	return ( eisa_loc->slot = ( ++eisa_loc->slot & EISA_MAX_SLOT ) );
 }
 
 /*

src/drivers/bus/mca.c

 	BUS_LOC_CHECK ( struct mca_loc );
 	BUS_DEV_CHECK ( struct mca_device );
 
-	return ( ++mca_loc->slot & MCA_MAX_SLOT_NR );
+	return ( mca_loc->slot = ( ++mca_loc->slot & MCA_MAX_SLOT_NR ) );
 }
 
 /*