Pokemon Gold prototype rom fixer

/* public domain */
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>

uint8_t* rom_space;

int main(void) {
    FILE* fp;

    rom_space = (uint8_t*)malloc(sizeof(uint8_t) * 1048576);
    if(rom_space == NULL) return 0;

    fp = fopen("Gold_debug.gbc","rb");
    if(fp == NULL) {
        puts("could not open Gold_debug.gbc!");
        free(rom_space);
        return 0;
    }

    fread(rom_space, sizeof(uint8_t), 1048576, fp);
    fclose(fp);
    rom_space[0x147] = 0x13;
    rom_space[0x14D] = 0xC4;

    fp = fopen("__GOLD_DEBUG_BLPATCHED.gbc","wb");
    if(fp == NULL) {
        puts("could not write the patched rom file");
        free(rom_space);
        return 0;
    }

    fwrite(rom_space, sizeof(uint8_t), 1048576, fp);
    fclose(fp);
    puts("Wrote patched file successfully!");

    free(rom_space);

    return 0;
}