Quit XBMC when TV is off

[mihailescu2m]

Well, /usr/local/share/xbmc/system/peripherals.xml contains:
<setting key="standby_pc_on_tv_standby" type="enum" value="13011" label="36029" order="7" lvalues="36028|13005|13011" />
This allows you in the XBMC menu to select from the drop down on "When the TV is switched off" the options: Ignore (36028), Suspend, and Shutdown. Adding 13009 will allow you to select "Quit" from the menu, resulting in rpi_2708_1001.xml "standby_pc_on_tv_standby" set to 13009.
Next, I am assuming that you need
m_configuration.bPowerOffOnStandby = iStandbyAction == 13009 ? 2 : 0;
line added to the patch as well. Then the code above.