Code review comments from pmooney (sundry), and igork (screwups in zonecfg refactoring)

*** 61,71 ****
  int     access(char *, int);
  int     alarm(int);
  int     auditsys(struct auditcalls *, rval_t *);
  int64_t brandsys(int, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t,
      uintptr_t);
! int     brk(caddr_t);
  int     chdir(char *);
  int     chmod(char *, int);
  int     chown(char *, uid_t, gid_t);
  int     chroot(char *);
  int     cladm(int, int, void *);
--- 61,71 ----
  int     access(char *, int);
  int     alarm(int);
  int     auditsys(struct auditcalls *, rval_t *);
  int64_t brandsys(int, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t,
      uintptr_t);
! intptr_t        brk(caddr_t);
  int     chdir(char *);
  int     chmod(char *, int);
  int     chown(char *, uid_t, gid_t);
  int     chroot(char *);
  int     cladm(int, int, void *);