Baro: example sketch to use healthy() function

libraries/AP_Baro/examples/BARO_generic/BARO_generic.pde

@@ -77,7 +77,8 @@ void loop()
         timer = hal.scheduler->micros();
         barometer.read();
         uint32_t read_time = hal.scheduler->micros() - timer;
-        if (!barometer.healthy) {
+        float alt = barometer.get_altitude();
+        if (!barometer.healthy()) {
             hal.console->println("not healthy");
             return;
         }
@@ -86,7 +87,7 @@ void loop()
         hal.console->print(" Temperature:");
         hal.console->print(barometer.get_temperature());
         hal.console->print(" Altitude:");
-        hal.console->print(barometer.get_altitude());
+        hal.console->print(alt);
         hal.console->printf(" climb=%.2f t=%u samples=%u",
                       barometer.get_climb_rate(),
                       (unsigned)read_time,