Build fixes for GPU samples.

samples/gpu/driver_api_multi.cpp

@@ -41,8 +41,8 @@ struct Worker: public ParallelLoopBody
     Worker(int num_devices)
     {
         count = num_devices;
-        contexts = new contexts CUcontext[num_devices];
-        for (int device_id = 0; i < num_devices; device_id++)
+        contexts = new CUcontext[num_devices];
+        for (int device_id = 0; device_id < num_devices; device_id++)
         {
             CUdevice device;
             safeCall(cuDeviceGet(&device, device_id));
@@ -90,7 +90,7 @@ struct Worker: public ParallelLoopBody
     {
         if ((contexts != NULL) && count != 0)
         {
-            for (int device_id = 0; i < num_devices; device_id++)
+            for (int device_id = 0; device_id < count; device_id++)
             {
                 safeCall(cuCtxDestroy(contexts[device_id]));
             }
@@ -130,7 +130,7 @@ int main()
     safeCall(cuInit(0));
 
     // Execute calculation
-    parallel_for_(cv::Range(0, num_devices, Worker(num_devices));
+    parallel_for_(cv::Range(0, num_devices), Worker(num_devices));
 
     return 0;
 }

samples/gpu/driver_api_stereo_multi.cpp

@@ -8,7 +8,6 @@
 #endif
 
 #include <iostream>
-#include "cvconfig.h"
 #include "opencv2/core/core.hpp"
 #include "opencv2/highgui/highgui.hpp"
 #include "opencv2/gpu/gpu.hpp"
@@ -169,7 +168,7 @@ int main(int argc, char** argv)
     contextOff();
 
     // Execute calculation in two threads using two GPUs
-    parallel_for_(cv::Range(0, 2, Worker());
+    parallel_for_(cv::Range(0, 2), Worker());
 
     // Release the first GPU resources
     contextOn(0);

samples/gpu/multi.cpp

@@ -72,7 +72,7 @@ int main()
     }
 
     // Execute calculation in several threads, 1 GPU per thread
-    parallel_for_(cv::Range(0, num_devices, Worker());
+    parallel_for_(cv::Range(0, num_devices), Worker());
 
     return 0;
 }