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Problem: If `FuzzedSock::Recv(N, MSG_PEEK)` is called then `N` bytes would be retrieved from the fuzz provider, saved in `m_peek_data` and returned to the caller (ok). If after this `FuzzedSock::Recv(M, 0)` is called where `M < N` then the first `M` bytes from `m_peek_data` would be returned to the caller (ok), but the remaining `N - M` bytes in `m_peek_data` would be discarded/lost (not ok). They must be returned by a subsequent `Recv()`. To resolve this, only remove the head `N` bytes from `m_peek_data`.