AP_Motors: re-order initialiser lines so -Werror=reorder will work

libraries/AP_Motors/AP_MotorsHeli_RSC.h

@@ -49,9 +49,9 @@ public:
     AP_MotorsHeli_RSC(SRV_Channel::Aux_servo_function_t aux_fn,
                       uint8_t default_channel,
                       uint8_t inst) :
+        _instance(inst),
         _aux_fn(aux_fn),
-        _default_channel(default_channel),
-        _instance(inst)
+        _default_channel(default_channel)
     {
         AP_Param::setup_object_defaults(this, var_info);
     };

libraries/AP_Motors/AP_MotorsHeli_Swash.cpp

@@ -89,8 +89,8 @@ const AP_Param::GroupInfo AP_MotorsHeli_Swash::var_info[] = {
 };
 
 AP_MotorsHeli_Swash::AP_MotorsHeli_Swash(uint8_t mot_0, uint8_t mot_1, uint8_t mot_2, uint8_t mot_3, uint8_t instance) :
-    _instance(instance),
-    _motor_num{mot_0, mot_1, mot_2, mot_3}
+    _motor_num{mot_0, mot_1, mot_2, mot_3},
+    _instance(instance)
 {
     AP_Param::setup_object_defaults(this, var_info);
 }

libraries/AP_Motors/AP_Motors_Thrust_Linearization.cpp

@@ -85,8 +85,8 @@ const AP_Param::GroupInfo Thrust_Linearization::var_info[] = {
 };
 
 Thrust_Linearization::Thrust_Linearization(AP_Motors& _motors) :
-    motors(_motors),
-    lift_max(1.0)
+    lift_max(1.0),
+    motors(_motors)
 {
     // setup battery voltage filtering
     batt_voltage_filt.set_cutoff_frequency(AP_MOTORS_BATT_VOLT_FILT_HZ);