nfsd: add __force to opaque verifier field casts

sparse complains that we're stuffing non-byte-swapped values into
__be32's here. Since they're supposed to be opaque, it doesn't matter
much. Just add __force to make sparse happy.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index f3f0487..a6be9d3 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -581,8 +581,12 @@
 	__be32 verf[2];
 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
-	verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
-	verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
+	/*
+	 * This is opaque to client, so no need to byte-swap. Use
+	 * __force to keep sparse happy
+	 */
+	verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
+	verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 	memcpy(verifier->data, verf, sizeof(verifier->data));
 }