6141 use kmem_zalloc instead of kmem_alloc + bzero/memset

*** 291,302 ****
                  }
                  usage = RCTLOP_GET_USAGE(rctl, curproc);
                  mutex_exit(&rset->rcs_lock);
                  mutex_exit(&curproc->p_lock);
  
!                 nblk = kmem_alloc(sizeof (rctl_opaque_t), KM_SLEEP);
!                 bzero(nblk, sizeof (rctl_opaque_t));
                  nblk->rcq_value = usage;
  
                  ret = copyout(nblk, new_rblk, sizeof (rctl_opaque_t));
                  kmem_free(nblk, sizeof (rctl_opaque_t));
                  kmem_free(krde, sizeof (rctl_dict_entry_t));
--- 291,301 ----
                  }
                  usage = RCTLOP_GET_USAGE(rctl, curproc);
                  mutex_exit(&rset->rcs_lock);
                  mutex_exit(&curproc->p_lock);
  
!                 nblk = kmem_zalloc(sizeof (rctl_opaque_t), KM_SLEEP);
                  nblk->rcq_value = usage;
  
                  ret = copyout(nblk, new_rblk, sizeof (rctl_opaque_t));
                  kmem_free(nblk, sizeof (rctl_opaque_t));
                  kmem_free(krde, sizeof (rctl_dict_entry_t));