message: samples(va): fix build warnings, use cv::format()
diff: #include <va/va.h>
  # include <va/va_drm.h>
  +#include "opencv2/core.hpp" // cv::format()
  +
  namespace va {
  bool openDisplay();
  @@ -70,10 +72,9 @@ static unsigned readId(const char* devName, const char* idName)
  {
  long int id = 0;
  - char fileName[256];
  - snprintf(fileName, sizeof(fileName), "%s/%s/%s", VA_INTEL_PCI_DIR, devName, idName);
  + std::string fileName = cv::format("%s/%s/%s", VA_INTEL_PCI_DIR, devName, idName);
  - FILE* file = fopen(fileName, "r");
  + FILE* file = fopen(fileName.c_str(), "r");
  if (file)
  {
  char str[16] = "";
  @@ -100,9 +101,8 @@ static int findAdapter(unsigned desiredVendorId)
  unsigned vendorId = readId(name, "vendor");
  if (vendorId == desiredVendorId)
  {
  - char subdirName[256];
  - snprintf(subdirName, sizeof(subdirName), "%s/%s/%s", VA_INTEL_PCI_DIR, name, "drm");
  - Directory subdir(subdirName);
  + std::string subdirName = cv::format("%s/%s/%s", VA_INTEL_PCI_DIR, name, "drm");
  + Directory subdir(subdirName.c_str());
  for (int j = 0; j < subdir.count(); ++j)
  {
  if (!strncmp(subdir[j]->d_name, "card", 4))
  @@ -130,18 +130,12 @@ public:
  numbers[1] = adapterIndex;
  for (int i = 0; i < NUM_NODES; ++i)
  {
  - int sz = sizeof(VA_INTEL_DRI_DIR) + strlen(names[i]) + 3;
  - paths[i] = new char [sz];
  - snprintf(paths[i], sz, "%s%s%d", VA_INTEL_DRI_DIR, names[i], numbers[i]);
  + paths[i] = cv::format("%s%s%d", VA_INTEL_DRI_DIR, names[i], numbers[i]);
  }
  }
  ~NodeInfo()
  {
  - for (int i = 0; i < NUM_NODES; ++i)
  - {
  - delete paths[i];
  - paths[i] = 0;
  - }
  + // nothing
  }
  int count() const
  {
  @@ -149,10 +143,10 @@ public:
  }
  const char* path(int index) const
  {
  - return ((index >= 0) && (index < NUM_NODES)) ? paths[index] : 0;
  + return ((index >= 0) && (index < NUM_NODES)) ? paths[index].c_str() : 0;
  }
  private:
  - char* paths[NUM_NODES];
  + std::string paths[NUM_NODES];
  };
  static bool openDeviceIntel();
  