AP_Airspeed: expose get_corrected_pressure()

needed for AP_Periph

libraries/AP_Airspeed/AP_Airspeed.h

@@ -160,6 +160,14 @@ public:
 
     static AP_Airspeed *get_singleton() { return _singleton; }
 
+    // return the current corrected pressure, public for AP_Periph
+    float get_corrected_pressure(uint8_t i) const {
+        return state[i].corrected_pressure;
+    }
+    float get_corrected_pressure(void) const {
+        return get_corrected_pressure(primary);
+    }
+    
 private:
     static AP_Airspeed *_singleton;
 
@@ -220,13 +228,7 @@ private:
     // return the differential pressure in Pascal for the last airspeed reading for the requested instance
     // returns 0 if the sensor is not enabled
     float get_pressure(uint8_t i);
-    // return the current corrected pressure
-    float get_corrected_pressure(uint8_t i) const {
-        return state[i].corrected_pressure;
-    }
-    float get_corrected_pressure(void) const {
-        return get_corrected_pressure(primary);
-    }
+
     // get the failure health probability
     float get_health_failure_probability(uint8_t i) const {
         return state[i].failures.health_probability;