Allow locking nullptr if the length is 0
Summary: Because apparently this is valid (and we test it). This also adds a check in mmap to make sure we aren't passing an invalid handle to `MapViewOfFileEx`. Reviewed By: yfeldblum Differential Revision: D3772853 fbshipit-source-id: 11593997a3fb12b7b391c5e52661060b71341aef
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