rpc: Fix the sending of >5800 byte messages

[Robert Shearman]

ChangeLog:
Fix the sending of >5800 byte messages by only adding offset to the
buffer after the first batch of data has been written to the pipe.

  dlls/rpcrt4/rpc_message.c |    6 +++---
  1 files changed, 3 insertions(+), 3 deletions(-)

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