Fixing some static analysis issues

modules/ml/src/nbayes.cpp

@@ -203,6 +203,7 @@ public:
             results = &_results;
             results_prob = !_results_prob.empty() ? &_results_prob : 0;
             rawOutput = _rawOutput;
+            value = 0;
         }
 
         const Mat* c;

modules/ml/src/rtrees.cpp

@@ -81,6 +81,7 @@ public:
         params.use1SERule = false;
         params.truncatePrunedTree = false;
         params.priors = Mat();
+        oobError = 0;
     }
     virtual ~DTreesImplForRTrees() {}
 

modules/ml/src/tree.cpp

@@ -115,7 +115,7 @@ DTreesImpl::WorkData::WorkData(const Ptr<TrainData>& _data)
     maxSubsetSize = 0;
 }
 
-DTreesImpl::DTreesImpl() {}
+DTreesImpl::DTreesImpl() : _isClassifier(false) {}
 DTreesImpl::~DTreesImpl() {}
 void DTreesImpl::clear()
 {