rpcrt4: Raise an exception if IRpcChannelBuffer_GetBuffer fails.

[Robert Shearman]

Make StdProxy_GetIID and StdProxy_GetChannel return void.

Don't bother checking for This and pRpcChannelBuffer being NULL as 
native doesn't.
---
  dlls/rpcrt4/cproxy.c |   25 ++++++++++++-------------
  1 files changed, 12 insertions(+), 13 deletions(-)
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