AP_HAL_SITL: AnalogSource: return bool for set_pin

libraries/AP_HAL_SITL/AnalogIn.cpp

@@ -58,8 +58,9 @@ float ADCSource::read_latest() {
     }
 }
 
-void ADCSource::set_pin(uint8_t pin) {
+bool ADCSource::set_pin(uint8_t pin) {
     _pin = pin;
+    return true;
 }
 
 void AnalogIn::init() {

libraries/AP_HAL_SITL/AnalogIn.h

@@ -14,7 +14,7 @@ public:
     /* implement AnalogSource virtual api: */
     float read_average() override;
     float read_latest() override;
-    void set_pin(uint8_t p) override;
+    bool set_pin(uint8_t p) override;
     float voltage_average() override;
     float voltage_latest() override;
     float voltage_average_ratiometric() override {