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Remove the general purpose spin-lock from getrandom, and don't spin when polling /dev/random. We also remove the use of spin locks when opening the persistent fd for platforms that require it. For both these cases, we can just use the pthread lock/unlock methods in libc. We also do some minor cleanup to better make use of Result types and DropGuards. Signed-off-by: Joe Richey <joerichey@google.com>
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