Fix control reaching end of non-void function

Author: M65649

scripts/make.sh

@@ -2,7 +2,7 @@
 
 SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )"
 
-TARGET=$SCRIPTPATH/../src/examples/mqtt_polling/mqtt_polling.ino
+TARGET=$SCRIPTPATH/../src/examples/low_power/low_power.ino
 EXTRA_ARGS=--clean
 
 if [ "$1" = "clean" ]; then

src/low_power.cpp

@@ -119,6 +119,8 @@ static uint16_t decodeSleepMultiplier(const SleepMultiplier sleep_multiplier) {
         return 30;
     case SleepMultiplier::TWO_SECONDS:
         return 2;
+    default:
+        return 0;
     }
 }
 
@@ -453,4 +455,6 @@ SleepStatusCode LowPowerClass::sleep(const SleepMode sleep_mode) {
     case SleepMode::DEEP:
         return deepSleep();
     }
+
+    return SleepStatusCode::OK;
 }