OSV-2021-152 Stack-buffer-overflow in ot::NetworkData::ServerTlv::GetServer16

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5878 Crash type: Stack-buffer-overflow READ 2 Crash state: ot::NetworkData::ServerTlv::GetServer16 ot::NetworkData::Leader::RlocLookup ot::NetworkData::Leader::RegisterNetworkData...