Fix do_exec.

#include <stdlib.h>

#include <sys/mount.h>

#include <sys/resource.h>

#include <sys/wait.h>

#include <linux/loop.h>

#include "init.h"

    pid = fork();

    if (!pid)

    {

        execv(par[0],par);

        execvp(par[0],par);

	exit(0);

    }

    else

    {

        while(wait(&status)!=pid);

        waitpid(pid, &status, 0);

        if (WEXITSTATUS(status) != 0) {

        	ERROR("exec: pid %1d exited with return code %d: %s", (int)pid, WEXITSTATUS(status), strerror(status));

        }

    }

    return 0;

}