[plt-scheme] Crash when using FFI callbacks.

[PLT v370, WinXP]

Hi,

I've attached a very small C library and corresponding Scheme FFI code
which results in MzScheme crashing when using more than _one_ FFI callback.

The crash was happening at seemingly random times, until I added a call
to 'collect-garbage' in the callback procedure (as suggested by Eli
Barzilay on #scheme). Now, the crash occurs instantly.

Is there any workaround to avoid this crash? Or am I using the FFI
library incorrectly?

Thanks in advance!
[sreeram;]
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