LU-14975 utils: non-recursive dir migration fix

LU-14975 utils: non-recursive dir migration fix

If sem_init() doesn't return 0, llapi_semantic_traverse() won't
call sem_fini() in directory traverse, therefore
cb_migrate_mdt_init() shouldn't increase param->fp_depth if it
reaches max depth in non-recursive mode.

Update sanity 230w.

Fixes: 5604a6d270b ("LU-14975 dne: dir migration in non-recursive mode")
Signed-off-by: Lai Syao <lai.siyao@whamcloud.com>
Change-Id: I8814aaae7c267cec51654175f9fa0708f7685a5a
Reviewed-on: https://review.whamcloud.com/47012
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Hongchao Zhang <hongchao@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>