Rover: Simplify boolean expression

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Rover/ekf_check.cpp

@@ -112,11 +112,7 @@ bool Rover::ekf_over_threshold()
         return true;
     }
 
-    if (ekf_position_ok()) {
-        return false;
-    }
-
-    return true;
+    return !ekf_position_ok();
 }
 
 // ekf_position_ok - returns true if the ekf claims it's horizontal absolute position estimate is ok and home position is set

Rover/mode_acro.cpp

@@ -49,7 +49,7 @@ void ModeAcro::update()
 
 bool ModeAcro::requires_velocity() const
 {
-    return g2.motors.have_skid_steering()? false: true;
+    return !g2.motors.have_skid_steering();
 }
 
 // sailboats in acro mode support user manually initiating tacking from transmitter