NFS4.x/pnfs: Fix up logging of layout stateids

If the layout is invalid, then just log a '0' value.
Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/nfs4trace.h

@@ -1815,7 +1815,7 @@ TRACE_EVENT(pnfs_update_layout,
 			__entry->count = count;
 			__entry->iomode = iomode;
 			__entry->reason = reason;
-			if (lo != NULL) {
+			if (lo != NULL && pnfs_layout_is_valid(lo)) {
 				__entry->layoutstateid_seq =
 				be32_to_cpu(lo->plh_stateid.seqid);
 				__entry->layoutstateid_hash =
@@ -1869,7 +1869,7 @@ DECLARE_EVENT_CLASS(pnfs_layout_event,
 			__entry->pos = pos;
 			__entry->count = count;
 			__entry->iomode = iomode;
-			if (lo != NULL) {
+			if (lo != NULL && pnfs_layout_is_valid(lo)) {
 				__entry->layoutstateid_seq =
 				be32_to_cpu(lo->plh_stateid.seqid);
 				__entry->layoutstateid_hash =