user32: Resend Check for NULL pData in DdeClientTransAction expecting to be passed a handle

[Jeff Latimer]

This is a case where two different errors are returned if pData is NULL 
depending on the value of cbData.  In this version I have move the code 
as suggested to WDML_ClientQueueExecute.

Jeff Latimer
---
  dlls/user32/dde_client.c |   18 ++++++++++++------
  dlls/user32/tests/dde.c  |    5 +----
  2 files changed, 13 insertions(+), 10 deletions(-)
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