NFSv4: Rename nfs4_copy_stateid()

It is really a function for selecting the correct stateid to use in a
read or write situation.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index c03ba77..38736dc 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1546,7 +1546,7 @@
 	nfs4_stateid stateid;
 
 	if (ctx->state != NULL) {
-		nfs4_copy_stateid(&stateid, ctx->state, l_ctx->lockowner, l_ctx->pid);
+		nfs4_select_rw_stateid(&stateid, ctx->state, l_ctx->lockowner, l_ctx->pid);
 		if (zero_seqid)
 			stateid.stateid.seqid = 0;
 		encode_nfs4_stateid(xdr, &stateid);