AP_InertialSensor: removed assert calls

these waste flash space and do not do us any good

libraries/AP_InertialSensor/AP_InertialSensor.cpp

@@ -774,7 +774,6 @@ void AP_InertialSensor::_start_backends()
 /* Find the N instance of the backend that has already been successfully detected */
 AP_InertialSensor_Backend *AP_InertialSensor::_find_backend(int16_t backend_id, uint8_t instance)
 {
-    assert(_backends_detected);
     uint8_t found = 0;
 
     for (uint8_t i = 0; i < _backend_count; i++) {

libraries/AP_InertialSensor/AP_InertialSensor_Invensense.cpp

@@ -1049,8 +1049,6 @@ int AP_Invensense_AuxiliaryBusSlave::_set_passthrough(uint8_t reg, uint8_t size,
 int AP_Invensense_AuxiliaryBusSlave::passthrough_read(uint8_t reg, uint8_t *buf,
                                                    uint8_t size)
 {
-    assert(buf);
-
     if (_registered) {
         hal.console->printf("Error: can't passthrough when slave is already configured\n");
         return -1;

libraries/AP_InertialSensor/AP_InertialSensor_Invensensev2.cpp

@@ -772,8 +772,6 @@ int AP_Invensensev2_AuxiliaryBusSlave::_set_passthrough(uint8_t reg, uint8_t siz
 int AP_Invensensev2_AuxiliaryBusSlave::passthrough_read(uint8_t reg, uint8_t *buf,
                                                    uint8_t size)
 {
-    assert(buf);
-
     if (_registered) {
         hal.console->printf("Error: can't passthrough when slave is already configured\n");
         return -1;

libraries/AP_InertialSensor/AuxiliaryBus.cpp

@@ -85,9 +85,6 @@ AuxiliaryBusSlave *AuxiliaryBus::request_next_slave(uint8_t addr)
 int AuxiliaryBus::register_periodic_read(AuxiliaryBusSlave *slave, uint8_t reg,
                                          uint8_t size)
 {
-    assert(slave->_instance == _n_slaves);
-    assert(_n_slaves < _max_slaves);
-
     int r = _configure_periodic_read(slave, reg, size);
     if (r < 0)
         return r;