Alexander Motin 28d70deaaf Fix race between first rand(3) calls.
Before this patch there was a chance for thread that called rand(3)
slightly later to see rand3_state already allocated, but not yet
initialized.  While this API is not expected to be thread-safe, it
is not expected to crash.  ztest on 64-thread system reproduced it
reliably for me.

MFC after:	1 month
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