fix static analysis issues

modules/calib3d/src/fisheye.cpp

@@ -104,8 +104,9 @@ void cv::fisheye::projectPoints(InputArray objectPoints, OutputArray imagePoints
 
     Vec4d k = _D.depth() == CV_32F ? (Vec4d)*_D.getMat().ptr<Vec4f>(): *_D.getMat().ptr<Vec4d>();
 
+    const bool isJacobianNeeded = jacobian.needed();
     JacobianRow *Jn = 0;
-    if (jacobian.needed())
+    if (isJacobianNeeded)
     {
         int nvars = 2 + 2 + 1 + 4 + 3 + 3; // f, c, alpha, k, om, T,
         jacobian.create(2*(int)n, nvars, CV_64F);
@@ -153,7 +154,7 @@ void cv::fisheye::projectPoints(InputArray objectPoints, OutputArray imagePoints
         else
             xpd[i] = final_point;
 
-        if (jacobian.needed())
+        if (isJacobianNeeded)
         {
             //Vec3d Xi = pdepth == CV_32F ? (Vec3d)Xf[i] : Xd[i];
             //Vec3d Y = aff*Xi;

modules/core/src/ocl.cpp

@@ -4435,6 +4435,7 @@ public:
         : size_(size), originPtr_(ptr), alignment_(alignment), ptr_(ptr), allocatedPtr_(NULL)
     {
         CV_DbgAssert((alignment & (alignment - 1)) == 0); // check for 2^n
+        CV_DbgAssert(!readAccess || ptr);
         if (((size_t)ptr_ & (alignment - 1)) != 0)
         {
             allocatedPtr_ = new uchar[size_ + alignment - 1];
@@ -4488,6 +4489,7 @@ public:
         : size_(rows*step), originPtr_(ptr), alignment_(alignment), ptr_(ptr), allocatedPtr_(NULL), rows_(rows), cols_(cols), step_(step)
     {
         CV_DbgAssert((alignment & (alignment - 1)) == 0); // check for 2^n
+        CV_DbgAssert(!readAccess || ptr != NULL);
         if (ptr == 0 || ((size_t)ptr_ & (alignment - 1)) != 0)
         {
             allocatedPtr_ = new uchar[size_ + extrabytes + alignment - 1];

modules/imgproc/src/canny.cpp

@@ -360,6 +360,8 @@ public:
     {
         CV_TRACE_FUNCTION();
 
+        CV_DbgAssert(cn > 0);
+
         Mat dx, dy;
         AutoBuffer<short> dxMax(0), dyMax(0);
         std::deque<uchar*> stack, borderPeaksLocal;