Corrected typo

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

4_grains/gtSaveCluster.m

@@ -19,7 +19,7 @@ function gtSaveCluster(phase_id, grain_ids, cluster, varargin)
     cluster_file = fullfile(phase_dir, sprintf('grain_cluster%s.mat', str_ids));
 
     if (isempty(conf.fields))
-        save(cluster_file, '-struct', 'grain', '-v7.3');
+        save(cluster_file, '-struct', 'cluster', '-v7.3');
     else
         mat_grain_file = matfile(cluster_file, 'Writable', true);
         for ii_f = 1:numel(conf.fields)