fix peer panic from fabric/gossip/util #3965

# to view logs

Job	Run time
Basic Checks	3m 11s
Basic Checks	3m 11s
Unit Tests	7m 22s
Unit Tests	7m 12s
Integration Tests (raft)	13m 20s
Integration Tests (raft)	13m 20s
Integration Tests (pvtdata)	14m 59s
Integration Tests (pvtdata)	14m 59s
Integration Tests (pvtdatapurge)	4m 51s
Integration Tests (pvtdatapurge)	4m 51s
Integration Tests (ledger)	15m 23s
Integration Tests (ledger)	15m 23s
Integration Tests (lifecycle)	11m 49s
Integration Tests (lifecycle)	11m 49s
Integration Tests (e2e)	8m 5s
Integration Tests (e2e)	8m 5s
Integration Tests (discovery gossip devmode pluggable)	11m 40s
Integration Tests (discovery gossip devmode pluggable)	11m 40s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	7m 29s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	7m 29s
Integration Tests (sbe nwo msp)	8m 53s
Integration Tests (sbe nwo msp)	8m 53s
	3h 33m 54s

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