Evaluate CUDA_CUB_RET_IF_FAIL macro argument only once

Author: jlowe

thrust/system/cuda/detail/core/util.h

@@ -652,7 +652,10 @@ namespace core {
   }
 
 #define CUDA_CUB_RET_IF_FAIL(e) \
-  if (cub::Debug((e), __FILE__, __LINE__)) return e;
+  do {                          \
+    auto const error = (e);     \
+    if (cub::Debug(error, __FILE__, __LINE__)) return error; \
+  } while(0);
 
   // uninitialized
   // -------