NFS: Get rid of nfs_restart_rpc()

It can trivially be replaced with rpc_restart_call_prepare.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index bfc20b1..e866a7e 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -435,7 +435,7 @@
 	argp->offset += resp->count;
 	argp->pgbase += resp->count;
 	argp->count -= resp->count;
-	nfs_restart_rpc(task, NFS_SERVER(data->inode)->nfs_client);
+	rpc_restart_call_prepare(task);
 }
 
 /*