Fixed a type in $mem model in simlib.v
Fixed a type in $mem model in simlib.v

cliffordwolf/yosys,YosysHQ/yosys,swallat/yosys,azonenberg/yosys,YosysHQ/yosys,YosysHQ/yosys,SymbiFlow/yosys,YosysHQ/yosys,swallat/yosys,cliffordwolf/yosys,swallat/yosys,antmicro/yosys,YosysHQ/yosys,antmicro/yosys,YosysHQ/yosys,swallat/yosys,azonenberg/yosys,SymbiFlow/yosys,swallat/yosys,antmicro/yosys,SymbiFlow/yosys,cliffordwolf/yosys,azonenberg/yosys,antmicro/yosys,SymbiFlow/yosys,cliffordwolf/yosys,swallat/yosys,swallat/yosys,YosysHQ/yosys,cliffordwolf/yosys,azonenberg/yosys,SymbiFlow/yosys,cliffordwolf/yosys,azonenberg/yosys,antmicro/yosys,SymbiFlow/yosys,SymbiFlow/yosys,swallat/yosys,azonenberg/yosys,cliffordwolf/yosys,azonenberg/yosys,cliffordwolf/yosys,SymbiFlow/yosys,swallat/yosys,antmicro/yosys,antmicro/yosys,azonenberg/yosys,cliffordwolf/yosys,antmicro/yosys,YosysHQ/yosys,azonenberg/yosys