Read from a file and store it in 2d array - c

Question

I am working on a function that reads from a file (fp) and stores in the words array. I declared MAX_WORD_SIZE as 128, but when I input any file into this function and check with valgrind, it tells me I have an uninitialized value in the line "while(getline(&line,&count,fp)!=-1)" I really don't get it: what is the uninitialised value? My fp file is valid and the word array is also declared well. Thank you in advance.
#include "functions.h"
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int read_file(FILE *fp, char words[][MAX_WORD_SIZE + 1], int size) {
int i=0;int j=0;
size_t count=MAX_WORD_SIZE;
char* line=malloc(MAX_WORD_SIZE);
while(getline(&line,&count,fp)!=-1){
for(;count>0;count--,j++){
sscanf(line,"%c",&words[i][j]);
}
i++;
}
int totalNums = i;
int totalNum = j;
if (i<size){
return 1;
}
fclose(fp);
return 0;
}
This is the function that I called this read_file function:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "functions.h"
int main(int argc, char *argv[]) {
const char* fileName = argv[1];
FILE *fp = fopen(fileName, "r");
if (fp == NULL) {
printf("Invalid input file\n");
return 1;
}
int size = 0;
int validity = fscanf(fp, "%d", &size);
int returnValue = 0;
char words[size][MAX_WORD_SIZE + 1];
if(validity != 1 || size <= 0) {
printf("The first line is not a valid number\n");
return 1;
}
returnValue = read_file(fp, words, size);
if (returnValue == 1) {
fclose(fp);
return 1;
}
return 0;
}