fixed defects from coverity.com

modules/calib3d/src/calibinit.cpp

@@ -1998,7 +1998,7 @@ bool cv::findCirclesGrid( InputArray _image, Size patternSize,
       {
         isFound = boxFinder.findHoles();
       }
-      catch (cv::Exception)
+      catch (const cv::Exception &)
       {
 
       }

modules/calib3d/src/compat_ptsetreg.cpp

@@ -57,6 +57,7 @@ CvLevMarq::CvLevMarq()
     criteria = cvTermCriteria(0,0,0);
     iters = 0;
     completeSymmFlag = false;
+    errNorm = prevErrNorm = DBL_MAX;
 }
 
 CvLevMarq::CvLevMarq( int nparams, int nerrs, CvTermCriteria criteria0, bool _completeSymmFlag )
@@ -101,7 +102,7 @@ void CvLevMarq::init( int nparams, int nerrs, CvTermCriteria criteria0, bool _co
         J.reset(cvCreateMat( nerrs, nparams, CV_64F ));
         err.reset(cvCreateMat( nerrs, 1, CV_64F ));
     }
-    prevErrNorm = DBL_MAX;
+    errNorm = prevErrNorm = DBL_MAX;
     lambdaLg10 = -3;
     criteria = criteria0;
     if( criteria.type & CV_TERMCRIT_ITER )

modules/calib3d/src/epnp.h

@@ -74,7 +74,6 @@ class epnp {
   int number_of_correspondences;
 
   double cws[4][3], ccs[4][3];
-  double cws_determinant;
   int max_nr;
   double * A1, * A2;
 };

modules/calib3d/src/ptsetreg.cpp

@@ -260,7 +260,6 @@ public:
 
     Ptr<PointSetRegistrator::Callback> cb;
     int modelPoints;
-    int maxBasicSolutions;
     bool checkPartialSubsets;
     double threshold;
     double confidence;