kernel32: Don't crash accessing an invalid handle in GlobalSize

[James Hawkins]

Hi,

Our DDE message 16<->32 conversion in user32 crashes when calling
GlobalSize on an atom (the parameter is either global memory or an
atom).

Changelog:
* Don't crash accessing an invalid handle in GlobalSize.

 dlls/kernel32/heap.c       |    6 ++++++
 dlls/kernel32/tests/heap.c |    7 +++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

-- 
James Hawkins
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