Test accuracy for PR#3829.Fix Some Error, Modify SLA.

modules/features2d/test/test_lshindex_flannbased_matcher.cpp

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 /*
- Authors: Ippei Ito
-
- for OpenCV2.4/OpenCV3.0
+ For OpenCV2.4/OpenCV3.0
 
  Test for Pull Request # 3829
  https://github.com/Itseez/opencv/pull/3829
@@ -434,7 +426,7 @@ public:
         // compare accuracies between the brute force matcher and the test target matcher
         if (average_accuracy < target_average_accuracy)
         {
-            ts->printf(cvtest::TS::LOG, "Bad average accuracy %f < %f while test %s %s query\n", average_accuracy, target_average_accuracy, flmatchername, tp.transname.c_str());
+            ts->printf(cvtest::TS::LOG, "Bad average accuracy %f < %f while test %s %s query\n", average_accuracy, target_average_accuracy, flmatchername.c_str(), tp.transname.c_str());
             ts->set_failed_test_info(cvtest::TS::FAIL_BAD_ACCURACY);
         }
         return;