over optimizing | Together C & C++ | Page 1

I am tryng to optimize the code even further but I can't think of a way to do that except code it in x86 direclty.
Note that this code is just for testing ,the malloc , free and printf are here for -O3 to not remove the unused parts and I plan on tranfering the main to a sperated function to return the malloced structure

#include <stdio.h>
#include <fcntl.h>
#include <CHK.h>

typedef struct s_Settings{
   bool a;
   bool b;
}*Settings;

int main() {
    int file_point = open("./test.txt",O_RDONLY,0666);
    CHK(file_point);
    Settings out = malloc(sizeof(struct s_Settings));
    char buff[2];
    read(file_point,buff,2);
    out->a = buff[0];
    out->b = buff[1];
    close(file_point);
    printf("%d%d",out->a,out->b);
    free(out);
    return 0;
}

//CHK.h
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>

#define CHK(op) do { if ((op) == -1) message (1, #op); } while (0)

void message(int syserr, const char *msg, ...);

//CHK.c
void message(int syserr, const char *msg, ...) {
    va_list ap;
    va_start (ap, msg);
    vfprintf(stderr, msg, ap);
    fprintf(stderr, "\n");
    va_end (ap);

    if (syserr == 1)
        perror("");

    exit(EXIT_FAILURE);
}

#over optimizing