EX-7601 osd: osd_bufs_put does not always handle all pages

EX-7601 osd: osd_bufs_put does not always handle all pages

osd_bufs_put asserts that the dio pages used after are
always zero, but there's no reason for this to be true and
compression specifically violates this by using 1 page at
a time.

Without this patch, we hit this assert and crash when
nonrotational = 1.

Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: If6bdb11f254c260e2da4cabe11a82693a468e6fb
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/52750
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>