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Otherwise nfsd_file_acquire, nfsd_file_insert_err, and
nfsd_file_cons_err will hit a NULL pointer when they are enabled and
LOCALIO used.

Example trace output (note xid is 0x0 and LOCALIO flag set):
 nfsd_file_acquire: xid=0x0 inode=0000000069a1b2e7
 may_flags=WRITE|LOCALIO ref=1 nf_flags=HASHED|GC nf_may=WRITE
 nf_file=0000000070123234 status=0

Fixes: c63f0e48

 ("nfsd: add nfsd_file_acquire_local()")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>