message: remove g_isOpenCVActivated assign and clarify
diff: @@ -1150,7 +1150,7 @@ void OpenCLExecutionContext::release()
  // true if we have initialized OpenCL subsystem with available platforms
  -static bool g_isOpenCVActivated = false;
  +static bool g_isOpenCLActivated = false;
  bool haveOpenCL()
  {
  @@ -1178,7 +1178,7 @@ bool haveOpenCL()
  {
  cl_uint n = 0;
  g_isOpenCLAvailable = ::clGetPlatformIDs(0, NULL, &n) == CL_SUCCESS;
  - g_isOpenCVActivated = n > 0;
  + g_isOpenCLActivated = n > 0;
  CV_LOG_INFO(NULL, "OpenCL: found " << n << " platforms");
  }
  catch (...)
  @@ -1214,7 +1214,7 @@ bool useOpenCL()
  bool isOpenCLActivated()
  {
  - if (!g_isOpenCVActivated)
  + if (!g_isOpenCLActivated)
  return false; // prevent unnecessary OpenCL activation via useOpenCL()->haveOpenCL() calls
  return useOpenCL();
  }
  @@ -6370,7 +6370,6 @@ public:
  static OpenCLAllocator* getOpenCLAllocator_() // call once guarantee
  {
  static OpenCLAllocator* g_allocator = new OpenCLAllocator(); // avoid destructor call (using of this object is too wide)
  - g_isOpenCVActivated = true;
  return g_allocator;
  }
  MatAllocator* getOpenCLAllocator()
  