Variable user_alarm_in_seconds will never be negative in modem_supervisor_engine

[EduardoPfeifer]

The var user_alarm_in_seconds will never be negative in modem_supervisor_engine because is unsigned.

SWL2001/smtc_modem_core/modem_supervisor/modem_supervisor_light.c

Lines 294 to 303 in c4f386a

	uint32_t alarm = modem_get_user_alarm( );
	uint32_t user_alarm_in_seconds = MODEM_MAX_ALARM_S / 1000;
	if( alarm != 0 )
	{
	user_alarm_in_seconds = ( int32_t )( alarm - smtc_modem_hal_get_time_in_s( ) );
	if( user_alarm_in_seconds <= 0 )
	{
	user_alarm_in_seconds = 0;
	}
	}

Here the type of user_alarm_in_seconds is signed

SWL2001/smtc_modem_core/modem_supervisor/modem_supervisor_light.c

Lines 336 to 354 in c4f386a

	static uint32_t supervisor_check_user_alarm( void )
	{
	uint32_t alarm = modem_get_user_alarm( );
	int32_t user_alarm_in_seconds = MODEM_MAX_ALARM_S;
	// manage the user alarm
	if( alarm != 0 )
	{
	user_alarm_in_seconds = ( int32_t )( alarm - smtc_modem_hal_get_time_in_s( ) );
	if( user_alarm_in_seconds <= 0 )
	{
	modem_set_user_alarm( 0 );
	user_alarm_in_seconds = MODEM_MAX_ALARM_S;
	increment_asynchronous_msgnumber( SMTC_MODEM_EVENT_ALARM, 0, 0xFF );
	}
	}
	return ( uint32_t ) user_alarm_in_seconds;
	}