kernel32: tests/change.c: initialize buffer

[Dan Kegel]

Even though the value being written doesn't matter to the test,
it's nice to avoid spurious valgrind errors.
Fixes:
 Syscall param write(buf) points to uninitialised byte(s)
    at  (within /lib/ld-2.7.so)
    by  WriteFile (file.c:559)
    by  test_FindFirstChangeNotification (change.c:226)
    by  func_change (change.c:875)
  Uninitialised value was created by a stack allocation
    at  test_FindFirstChangeNotification (change.c:88)
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