Bluetooth: controller: Fix integer overflow in scheduling code
Bluetooth: controller: Fix integer overflow in scheduling code

Fix an integer overflow in the scheduling implementation
that calculates whether resources required for next radio
event be retained.

Signed-off-by: Vinayak Kariappa Chettimada <e780c9f87dc729ad454f47292ad82c8652353064@nordicsemi.no>

galak/zephyr,ldts/zephyr,Vudentz/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,nashif/zephyr,explora26/zephyr,finikorg/zephyr,Vudentz/zephyr,punitvara/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,nashif/zephyr,explora26/zephyr,punitvara/zephyr,punitvara/zephyr,explora26/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,ldts/zephyr,galak/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,Vudentz/zephyr,nashif/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,nashif/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr