knfsd: nfsd4: fix NFSv4 filehandle size units confusion

NFS4_FHSIZE is measured in bytes, not 4-byte words, so much more space than
necessary is being allocated for struct nfs4_cb_recall.

I should have wondered why this structure was so much larger than it needed to
be!

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/nfsd/state.h

@@ -67,7 +67,7 @@ struct nfs4_cb_recall {
 	int			cbr_trunc;
 	stateid_t		cbr_stateid;
 	u32			cbr_fhlen;
-	u32			cbr_fhval[NFS4_FHSIZE];
+	char			cbr_fhval[NFS4_FHSIZE];
 	struct nfs4_delegation	*cbr_dp;
 };