remaining C error

Author: petrelharp

c/tests/test_stats.c

@@ -3666,7 +3666,7 @@ test_two_locus_stat_input_errors(void)
         NULL, 0, result);
     CU_ASSERT_EQUAL_FATAL(ret, TSK_ERR_INSUFFICIENT_INDEX_TUPLES);
 
-    num_sample_sets = 1;
+    num_sample_sets = 0;
     num_index_tuples = 1;
     ret = tsk_treeseq_D2_ij(&ts, num_sample_sets, sample_set_sizes, sample_sets,
         num_index_tuples, index_tuples, num_sites, row_sites, NULL, num_sites, col_sites,