remove file size check

in preparation for multiprocessing.

Each process downloads its own chunks, this check cannot be done unless
there is a way to report each process the amount of bytes receives
(via interprocess communication).

Or simply use threads instead of process.

src/main.c

@@ -667,12 +667,6 @@ int main(int argc, char *argv[])
 	gettimeofday(&tv_stop, NULL);
 	timersub(&tv_stop, &tv_start, &tv);
 
-	if (data_len != file_size) {
-		syslog(LOG_ERR, "Failure, file size is %lu bytes but received %lu bytes!\n",
-		       file_size, data_len);
-		return EXIT_FAILURE;
-	}
-
 	return tip_client_report(&_cli, &tv, data_len);
 
 err_bailout: