fixing issues from coverity scan 1167937, 1167938, 1167939, 1127248 (http://scan.coverity.com/projects/169?tab=Overview)

modules/core/src/ocl.cpp

@@ -2545,7 +2545,6 @@ struct Queue::Impl
     IMPLEMENT_REFCOUNTABLE();
 
     cl_command_queue handle;
-    bool initialized;
 };
 
 Queue::Queue()

modules/nonfree/src/surf.hpp

@@ -69,7 +69,6 @@ protected:
     bool detectKeypoints(UMat &keypoints);
 
     const SURF* params;
-    int refcount;
 
     //! max keypoints = min(keypointsRatio * img.size().area(), 65535)
     UMat sum, intBuffer;

modules/objdetect/include/opencv2/objdetect.hpp

@@ -246,7 +246,7 @@ public:
     CV_WRAP HOGDescriptor() : winSize(64,128), blockSize(16,16), blockStride(8,8),
         cellSize(8,8), nbins(9), derivAperture(1), winSigma(-1),
         histogramNormType(HOGDescriptor::L2Hys), L2HysThreshold(0.2), gammaCorrection(true),
-        nlevels(HOGDescriptor::DEFAULT_NLEVELS)
+        free_coef(-1.f), nlevels(HOGDescriptor::DEFAULT_NLEVELS)
     {}
 
     CV_WRAP HOGDescriptor(Size _winSize, Size _blockSize, Size _blockStride,
@@ -257,7 +257,7 @@ public:
     : winSize(_winSize), blockSize(_blockSize), blockStride(_blockStride), cellSize(_cellSize),
     nbins(_nbins), derivAperture(_derivAperture), winSigma(_winSigma),
     histogramNormType(_histogramNormType), L2HysThreshold(_L2HysThreshold),
-    gammaCorrection(_gammaCorrection), nlevels(_nlevels)
+    gammaCorrection(_gammaCorrection), free_coef(-1.f), nlevels(_nlevels)
     {}
 
     CV_WRAP HOGDescriptor(const String& filename)