Plane: fixed use of HAL soft_armed

ArduPlane/ArduPlane.pde

@@ -1561,7 +1561,7 @@ static void determine_is_flying(void)
                         gps.ground_speed() >= 5);
 
 
-    if(arming.is_armed()) {
+    if (hal.util->get_soft_armed()) {
         // when armed, we need overwhelming evidence that we ARE NOT flying
         isFlyingBool = airspeedMovement || gpsMovement;
 
@@ -1576,16 +1576,13 @@ static void determine_is_flying(void)
 
 static bool is_flying(void)
 {
-    if(arming.is_armed()) {
+    if (hal.util->get_soft_armed()) {
         // when armed, assume we're flying unless we probably aren't
         return (isFlyingProbability >= 0.1f);
     }
-    else
-    {
-        // when disarmed, assume we're not flying unless we probably are
-        return (isFlyingProbability >= 0.9f);
-    }
 
+    // when disarmed, assume we're not flying unless we probably are
+    return (isFlyingProbability >= 0.9f);
 }