Code review notes fixed.

cmake/checks/OpenCVDetectCudaArch.cu

@@ -0,0 +1,14 @@
+#include <stdio.h>
+int main()
+{
+    int count = 0;
+    if (cudaSuccess != cudaGetDeviceCount(&count)){return -1;}
+    if (count == 0) {return -1;}
+    for (int device = 0; device < count; ++device)
+    {
+        cudaDeviceProp prop;
+        if (cudaSuccess != cudaGetDeviceProperties(&prop, device)){ continue;}
+        printf("%d.%d ", prop.major, prop.minor);
+    }
+    return 0;
+}