NFS: nfs_delegation_find_inode_server must first reference the superblock

mainline inclusion
from mainline-v5.11-rc4
commit 113aac6d567bda783af36d08f73bfda47d8e9a40
category: bugfix
bugzilla: NA
CVE: NA

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Before referencing the inode, we must ensure that the superblock can be
referenced. Otherwise, we can end up with iput() calling superblock
operations that are no longer valid or accessible.

Fixes: e39d8a18 ("NFSv4: Fix an Oops during delegation callbacks")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>