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.

Jeff Latimer

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