fix(bhi, leds): fixed faulty error handling due to always-false unsigned comparisons

epicardium/modules/bhi.c

@@ -131,7 +131,7 @@ int epic_bhi160_enable_sensor(
 	int result = 0;
 
 	bhy_virtual_sensor_t vs_id = bhi160_lookup_vs_id(sensor_type);
-	if (vs_id < 0) {
+	if (vs_id == (bhy_virtual_sensor_t)-1) {
 		return -ENODEV;
 	}
 
@@ -188,7 +188,7 @@ int epic_bhi160_disable_sensor(enum bhi160_sensor_type sensor_type)
 	int result = 0;
 
 	bhy_virtual_sensor_t vs_id = bhi160_lookup_vs_id(sensor_type);
-	if (vs_id < 0) {
+	if (vs_id == (bhy_virtual_sensor_t)-1) {
 		return -ENODEV;
 	}
 

pycardium/modules/sys_leds.c

@@ -203,7 +203,7 @@ static MP_DEFINE_CONST_FUN_OBJ_2(leds_set_rocket_obj, mp_leds_set_rocket);
 static mp_obj_t mp_leds_get_rocket(mp_obj_t led_in)
 {
 	int led = mp_obj_get_int(led_in);
-	uint8_t ret = epic_leds_get_rocket(led);
+	int ret = epic_leds_get_rocket(led);
 	if (ret == -EINVAL) {
 		mp_raise_ValueError(
 			"invalid value: maybe the led does not exists"

pycardium/mphalport.c

@@ -112,7 +112,7 @@ void epic_isr_ctrl_c(void)
 
 void mp_hal_set_interrupt_char(char c)
 {
-	if (c != -1) {
+	if (c != '\xFF') {
 		mp_obj_exception_clear_traceback(
 			MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception))
 		);