img.c line 153
Missing fclose
	if (r < 0) {
		fp_err("pgm header write failed, error %d", r);
		return r;
	}

as well line 159
	r = fwrite(img->data, 1, write_size, fd);
	if (r < write_size) {
		fp_err("short write (%d)", r);
		return -EIO;
	}