NFSD: De-duplicate hash bucket indexing

Clean up: The details of finding the right hash bucket are exactly
the same in both nfsd_cache_lookup() and nfsd_cache_update().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2021-09-30 19:19:57 -04:00
commit 378a6109dd