Minor thing: the patch has tabbed intentation in places rather than spaces.

As I understand it, if there is no entropy initialized, this patch will fall back to reading /dev/urandom, which will return predictable data (opposite of “random” data!). But since we take this non-strict fallback in other cases (e.g. no OS support), there is a decent argument for also taking the predictable fallback path when entropy is uninitialized.