LU-16281 clio: append to non-existent component

LU-16281 clio: append to non-existent component

should return an error, but it fails now with a BUG below
because @rc of lov_io_layout_at() is not checked for < 0

    stripe_width()) ASSERTION( index < lsm->lsm_entry_count ) failed:
    BUG: unable to handle kernel paging request at ffff99d3c2f74030
    Call Trace:
      lov_stripe_number+0x19/0x40 [lov]
      lov_page_init_composite+0x103/0x5f0 [lov]
      ? kmem_cache_alloc+0x12e/0x270
      cl_page_alloc+0x19f/0x660 [obdclass]
      cl_page_find+0x1a0/0x250 [obdclass]
      ll_write_begin+0x1f7/0xfb0 [lustre]

Lustre-change: https://review.whamcloud.com/48994
Lustre-commit: 8fdeca3b6faf22c72f6687aa23b86715d39ceeb1

HPE-bug-id: LUS-11075
Signed-off-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Change-Id: I4371f56cd9cdb3429d52a283831fb0a768e5c9c3
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/54133
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Zhenyu Xu <bobijam@hotmail.com>