Realloc and sscanf into a function

I have a file who has num lines: every line contains one number. I want to save every number into a vector *vet. Why this code doesn't work?

Segmentation fault (core dumped)

I think that the error is sscanf in save_numbers function, but I don't know why.

#include <stdio.h>
#include <stdlib.h>

/* This function allocate memory
and save numbers into a vector */
int save_numbers (int **vet, int *num)
{
    FILE *fin;
    int i = 0;
    char buff[10];

    if ( !(fin = fopen("numbers.dat", "r")) )
        return 1;

    while ( fgets(buff, sizeof(buff), fin) )
    {
        *vet = (int *) realloc (*vet, (i+1) * sizeof(int) );
        sscanf (buff, "%d", vet[i]);
        i++;
    }

    *num = i;

    return fclose(fin);
}

int main ()
{
    int i, num, *vet = NULL;    

    if ( save_numbers(&vet, &num) )
    {
        perror("numbers.dat");
        exit(1);
    }

    /* print test */
    for (i=0; i<num; i++)
        printf ("%d ", vet[i]);
    printf("\n");

    free(vet);

    return 0;
}

Example of file here: http://pastebin.com/uCa708L0