AP_Motors: add missing break to Hexa-H

libraries/AP_Motors/AP_MotorsMatrix.cpp

@@ -599,6 +599,7 @@ void AP_MotorsMatrix::setup_motors(motor_frame_class frame_class, motor_frame_ty
                     add_motor_raw(AP_MOTORS_MOT_4, -1.0f, -1.0f, AP_MOTORS_MATRIX_YAW_FACTOR_CCW, 3);
                     add_motor_raw(AP_MOTORS_MOT_5, -1.0f, 1.0f, AP_MOTORS_MATRIX_YAW_FACTOR_CCW, 1);
                     add_motor_raw(AP_MOTORS_MOT_6, 1.0f, -1.0f, AP_MOTORS_MATRIX_YAW_FACTOR_CW, 4);
+                    break;
                 default:
                     // hexa frame class does not support this frame type
                     success = false;