fix peer panic from fabric/gossip/util #3961

# to view logs

Job	Run time
Basic Checks	1m 54s
Unit Tests	24m 58s
Integration Tests (raft)	12m 30s
Integration Tests (pvtdata)	13m 32s
Integration Tests (pvtdatapurge e2e)	17m 14s
Integration Tests (ledger)	13m 29s
Integration Tests (lifecycle)	5m 51s
Integration Tests (smartbft)	22m 15s
Integration Tests (discovery gossip devmode pluggable)	11m 19s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	18m 57s
Integration Tests (sbe nwo msp)	9m 50s
	2h 31m 49s

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