rpcrt4: Don't use BufferEnd in RpcStream_Write.

[Robert Shearman]

It is usually used during marshalling, where pStubMsg->BufferStart and 
pStubMsg->BufferEnd won't be valid. Replace it with a check using 
RpcMsg->Buffer and pStubMsg->BufferLength.
---
  dlls/rpcrt4/ndr_ole.c |    6 +++---
  1 files changed, 3 insertions(+), 3 deletions(-)
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