Kernel32: Fix GlobalReAlloc for size = 0

[Robert Shearman]

Fixes bug #4249.

ChangeLog:
GlobalReAlloc should return NULL if the requested size is 0, the block
is moveable and it is locked, but otherwise it should return the
original memory block.

  dlls/kernel/heap.c |   12 +++++++++---
  1 files changed, 9 insertions(+), 3 deletions(-)

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