sysbus: fix reading not holding address

sysbus/sysbus.vhdl

@@ -73,9 +73,11 @@ begin
     case state is
       when READING =>
         if owner = "10" then
+          bus_addr <= m0_addr;
           m0_rdata <= bus_rdata;
           m1_busy <= '1';
         else
+          bus_addr <= m1_addr;
           m1_rdata <= bus_rdata;
           m0_busy <= '1';
         end if;