fix warning in release build of fc
fix warning in release build of fc

FollowMyVote/bitshares,frrp/bitshares,bitshares/devshares,bitshares/devshares,jakeporter/Bitshares,denkhaus/bitsharesx,bitsuperlab/cpp-play,RemitaBit/Remitabit,camponez/bitshares,bitshares/devshares,jakeporter/Bitshares,bitsuperlab/cpp-play,bitshares/devshares,bitshares/devshares,RemitaBit/Remitabit,FollowMyVote/bitshares,bitshares/bitshares-0.x,bitshares/bitshares-0.x,jakeporter/Bitshares,bitshares/bitshares,dacsunlimited/dac_play,drltc/keyid,Ziftr/bitshares,FollowMyVote/bitshares,jakeporter/Bitshares,camponez/bitshares,bitsuperlab/cpp-play,bitsuperlab/cpp-play,bitshares/bitshares,denkhaus/bitsharesx,denkhaus/bitsharesx,FollowMyVote/bitshares,frrp/bitshares,FollowMyVote/bitshares,drltc/keyid,RemitaBit/Remitabit,camponez/bitshares,Ziftr/bitshares,jakeporter/Bitshares,dacsunlimited/dac_play,denkhaus/bitsharesx,bitshares/bitshares,bitshares/bitshares,bitshares/devshares,FollowMyVote/bitshares,frrp/bitshares,bitsuperlab/cpp-play,bitshares/bitshares-0.x,dacsunlimited/dac_play,dacsunlimited/dac_play,RemitaBit/Remitabit,RemitaBit/Remitabit,bitshares/bitshares-0.x,bitshares/bitshares,bitshares/bitshares-0.x,jakeporter/Bitshares,drltc/keyid,drltc/keyid,bitshares/bitshares,camponez/bitshares,camponez/bitshares,RemitaBit/Remitabit,camponez/bitshares,bitshares/bitshares-0.x,bitsuperlab/cpp-play,frrp/bitshares,frrp/bitshares,dacsunlimited/dac_play,dacsunlimited/dac_play,Ziftr/bitshares,frrp/bitshares,Ziftr/bitshares