Fix issue breaking cudagraphs (#685)
Fix issue breaking cudagraphs (#685)

@ngimel figured this one out. 

The errors we were seeing from cudagraphs capture were coming from
`cuStreamGetCtx` which is not allowed while a stream is capturing.

It appears the result of `cuStreamGetCtx()` isn't even used, so I
believe it can just be removed.
openai/triton,openai/triton