LU-15513 lod: iterate initialized stripe

LU-15513 lod: iterate initialized stripe

Fix an array out of bounds access.

Do not iterate over the component objects in lod_fill_mirrors() to
check non-rotational OSTs if the component is unintialized or it is
a MDT or RELEASED component.

Fixes: 591a990c61 ("LU-15513 lod: skip uninit component in lod_fill_mirrors")
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I8530cd30fab750c47f15ee9278ec6d68871367cc
Reviewed-on: https://review.whamcloud.com/47028
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>