Fix underflow and fix wireguard platform init#4
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Two problems I found when testing the connectivity to the
https://controlplane.tailscale.com.The first is a underflow in some JSON validation code, which made it mark
{"KeepAlive":true}as invalid. Not sure if it was affecting any functionality.Another is calling
wireguard_platform_initbefore using wireguard functions. Otherwise, it was getting stuck inwireguard_create_handshake_initiation, in a infinite loop generating random values, which were always equal due to the generator being uninitialized.