FFI: Make FFI call return nil when C function returns NULL Before when a C function returned NULL pointer, an ExternalAddress with address 0 wes returned which required an extra check in a caller to convert it to nil, which would be the customary. This commit automatically converts NULL pointers to Smalltalk `nil` as a courtesy to a Smalltalker.

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LIBRARY libbasic

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DESCRIPTION     'Smalltalk/X Basic classes'

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VERSION         3.5

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CODE            EXECUTE READ 

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DATA            READ WRITE

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SECTIONS

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    INITCODE    READ EXECUTE 

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    INITDATA    READ WRITE 

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EXPORTS 

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    _libbasic_Init