NFSD: Fix licensing header in filecache.c

Add a missing SPDX header.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
This commit is contained in:
Chuck Lever 2022-10-31 09:53:26 -04:00
commit 3f054211b2