NFS: Cleanup - only store the write verifier in struct nfs_page

The 'committed' field is not needed once we have put the struct nfs_page
on the right list.

Also correct the type of the verifier: it is not an array of __be32, but
simply an 8 byte long opaque array.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index e134029..85b7063 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -351,9 +351,9 @@
 	struct nfs_page *first = nfs_list_entry(data->pages.next);
 
 	data->task.tk_status = 0;
-	memcpy(data->verf.verifier, first->wb_verf.verifier,
-	       sizeof(first->wb_verf.verifier));
-	data->verf.verifier[0]++; /* ensure verifier mismatch */
+	memcpy(&data->verf.verifier, &first->wb_verf,
+	       sizeof(data->verf.verifier));
+	data->verf.verifier.data[0]++; /* ensure verifier mismatch */
 }
 
 static int filelayout_commit_done_cb(struct rpc_task *task,