Fix dangling refs

[ArkinSolomon]

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Fixes #3

[eleccoder]

Hi Arkin, thanks for your patch ! However, instead of moving the definitions of the struct instances into file scope, I'd prefer to leave them in their function scope, because the latter is narrower. Instead, I'd declare both struct instances as "static" to achieve program lifetime. I realized that this was also done in the reference code, but obviously, I ignored that for any reason ... What do you think ?

[eleccoder]

Fixed by commit 097b411ae96362072d6ca8354de15d1606d3728e