Safely handle offset in fd_seek #4557
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This commit fixes [wasmerio#4556][1]. Passing in a negative offset along with `whence::set` causes wasmer to erroneously seek to a very large offset. [1]: wasmerio#4556
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Description
This PR fixes #4556. Passing in a negative offset along with
whence::setcauses wasmer to erroneously seek to a very large offset.