[1/5] user32: Resend: Check for NULL pData in DdeClientTransAction expecting to be passed a handle

[Jeff Latimer]

This patch sets the appropriate error condition if the pData passed is 
NULL.  There are 2 variants of returned depending on whether cbData 
indicates a a data block or a data handle is being passed.

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


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