user32: in MDI_ChildActivate handle NULL return from get_client_info (coverity 261)

[Aric Stewart]

This could occur in cross process window cases or if the window is not 
an MDI window.
---
  dlls/user32/mdi.c |    6 ++++++
  1 files changed, 6 insertions(+), 0 deletions(-)


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