Function usage

tools/top/top.c:4–10

#include "ff_ipc.h"

void
usage(void)
{
    printf("Usage:\n");
    printf("  top [-p <f-stack proc_id>] [-P <max proc_id>] "
        "[-d <secs>] [-n <num>]\n");
}

int cpu_status(struct ff_top_args *top)
{