Fix typo in comment

Signed-off-by: Wouter Bijlsma <[email protected]>

Author: w0utert

nanovdb/nanovdb/util/cuda/CudaUtils.h

@@ -55,7 +55,7 @@
 
 // cudaMallocAsync and cudaFreeAsync were introduced in CUDA 11.2, for older CUDA 
 // versions fall back to cudaMalloc and cudaFree. The fallback can also be forced 
-// using the USE_SYNC_CUDA_MALLOC flag. This may be useful when deploying nanoVDB
+// using the NANOVDB_USE_SYNC_CUDA_MALLOC flag. This may be useful when deploying nanoVDB
 // code in virtualized environments that share the GPU between instances by slicing
 // it up into vGPU's. In such environments GPU unified memory is usually disabled
 // out of security considerations, which means cudaMallocAsync can not be used.
@@ -148,4 +148,4 @@ __device__ inline bool cudaStrEq(const char *lhs, const char *rhs)
 
 #endif// __CUDACC__
 
-#endif// NANOVDB_CUDA_UTILS_H_HAS_BEEN_INCLUDED
+#endif// NANOVDB_CUDA_UTILS_H_HAS_BEEN_INCLUDED