RC_Channel_aux: fixed a uninitialied variable error, and save a bit of stack space

libraries/RC_Channel/RC_Channel_aux.cpp

@@ -74,13 +74,13 @@ RC_Channel_aux::output_ch(unsigned char ch_nr)
 void update_aux_servo_function(RC_Channel_aux* rc_5, RC_Channel_aux* rc_6, RC_Channel_aux* rc_7, RC_Channel_aux* rc_8)
 {
 	// positions 0..3 of this array never get used, but this is a stack array, so the entire array gets freed at the end of the function
-	RC_Channel_aux::Aux_servo_function_t aux_servo_function[NUM_CHANNELS];			// the function of the aux. servos
-	aux_servo_function[CH_5] = (RC_Channel_aux::Aux_servo_function_t)rc_5->function.get();
-	aux_servo_function[CH_6] = (RC_Channel_aux::Aux_servo_function_t)rc_6->function.get();
-	aux_servo_function[CH_7] = (RC_Channel_aux::Aux_servo_function_t)rc_7->function.get();
-	aux_servo_function[CH_8] = (RC_Channel_aux::Aux_servo_function_t)rc_8->function.get();
+	RC_Channel_aux::Aux_servo_function_t aux_servo_function[4];
+	aux_servo_function[0] = (RC_Channel_aux::Aux_servo_function_t)rc_5->function.get();
+	aux_servo_function[1] = (RC_Channel_aux::Aux_servo_function_t)rc_6->function.get();
+	aux_servo_function[2] = (RC_Channel_aux::Aux_servo_function_t)rc_7->function.get();
+	aux_servo_function[3] = (RC_Channel_aux::Aux_servo_function_t)rc_8->function.get();
 
-	for (uint8_t i = 0; i < NUM_CHANNELS; i++) {
+	for (uint8_t i = 0; i < 4; i++) {
 		if (aux_servo_function[i] >= RC_Channel_aux::k_nr_aux_servo_functions) {
 			// invalid setting
 			aux_servo_function[i] = RC_Channel_aux::k_none;
@@ -94,10 +94,10 @@ void update_aux_servo_function(RC_Channel_aux* rc_5, RC_Channel_aux* rc_6, RC_Ch
 	}
 
 	// assign the RC channel to each function
-	g_rc_function[aux_servo_function[CH_5]] = rc_5;
-	g_rc_function[aux_servo_function[CH_6]] = rc_6;
-	g_rc_function[aux_servo_function[CH_7]] = rc_7;
-	g_rc_function[aux_servo_function[CH_8]] = rc_8;
+	g_rc_function[aux_servo_function[0]] = rc_5;
+	g_rc_function[aux_servo_function[1]] = rc_6;
+	g_rc_function[aux_servo_function[2]] = rc_7;
+	g_rc_function[aux_servo_function[3]] = rc_8;
 
 	//set auxiliary ranges
 	G_RC_AUX(k_flap)->set_range(0,100);