[UR][CUDA] Fix stream guard in async alloc

Author: npmiller

unified-runtime/source/adapters/cuda/async_alloc.cpp

@@ -25,7 +25,7 @@ UR_APIEXPORT ur_result_t UR_APICALL urEnqueueUSMDeviceAllocExp(
 
   ScopedContext Active(hQueue->getDevice());
   uint32_t StreamToken;
-  ur_stream_guard_ Guard;
+  ur_stream_guard Guard;
   CUstream CuStream = hQueue->getNextComputeStream(
       numEventsInWaitList, phEventWaitList, Guard, &StreamToken);
 
@@ -83,7 +83,7 @@ UR_APIEXPORT ur_result_t UR_APICALL urEnqueueUSMFreeExp(
 
   ScopedContext Active(hQueue->getDevice());
   uint32_t StreamToken;
-  ur_stream_guard_ Guard;
+  ur_stream_guard Guard;
   CUstream CuStream = hQueue->getNextComputeStream(
       numEventsInWaitList, phEventWaitList, Guard, &StreamToken);