rpcrt4: Return an error from rpcrt4_conn_tcp_read if recv returns 0.

[Robert Shearman]

It does this on Mac OS X when the other end of the socket is closed and 
would otherwise get into an infinite loop.
---
  dlls/rpcrt4/rpc_transport.c |    7 ++++++-
  1 files changed, 6 insertions(+), 1 deletions(-)
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