fixed an error in use smartbft #3740

Job	Run time
Basic Checks	1m 17s
Unit Tests	8m 33s
Integration Tests (raft)	13m 5s
Integration Tests (pvtdata)	11m 49s
Integration Tests (pvtdatapurge e2e)	10m 41s
Integration Tests (ledger)	14m 59s
Integration Tests (lifecycle)	5m 7s
Integration Tests (smartbft)	20m 46s
Integration Tests (discovery gossip devmode pluggable)	5m 49s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	17m 37s
Integration Tests (sbe nwo msp)	7m 48s
	1h 57m 31s

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