LU-19016 target: reset o_grant if no grant is returned

LU-19016 target: reset o_grant if no grant is returned

tgt_grant_dealloc() should reset o_grant (which goes back
to the client) if the server doesn't want to return grants.

Test-Parameters: testlist=sanity
Test-Parameters: testlist=sanity
Test-Parameters: testlist=sanity
Test-Parameters: testlist=sanity-quota,sanity-quota
Fixes: df2b5d99ad ("LU-17933 target: do not break grants on RPC failure")
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I33851c1e023534f6b5cf3c5596a23b0835a3fe01
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/59234
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sergey Cheremencev <scherementsev@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>