Fix failing test case qlc_SUITE:lookup2/1
Fix failing test case qlc_SUITE:lookup2/1

5239eb0c62a9 removed some optimizations in `sys_core_fold`, and
because of that two warnings are no longer emitted.

lrascao/otp,erlang/otp,potatosalad/otp,potatosalad/otp,g-andrade/otp,kvakvs/otp,emacsmirror/erlang,bjorng/otp,g-andrade/otp,ferd/otp,getong/otp,vinoski/otp,potatosalad/otp,g-andrade/otp,isvilen/otp,ferd/otp,ferd/otp,rlipscombe/otp,bsmr-erlang/otp,bsmr-erlang/otp,bsmr-erlang/otp,isvilen/otp,kvakvs/otp,aboroska/otp,vladdu/otp,erlang/otp,electricimp/otp,getong/otp,bjorng/otp,potatosalad/otp,RoadRunnr/otp,rlipscombe/otp,dgud/otp,kvakvs/otp,RoadRunnr/otp,vladdu/otp,erlang/otp,uabboli/otp,jj1bdx/otp,kvakvs/otp,getong/otp,getong/otp,emacsmirror/erlang,vinoski/otp,RoadRunnr/otp,legoscia/otp,emacsmirror/erlang,rlipscombe/otp,vinoski/otp,isvilen/otp,ferd/otp,bjorng/otp,g-andrade/otp,vinoski/otp,lrascao/otp,erlang/otp,mikpe/otp,potatosalad/otp,erlang/otp,getong/otp,lrascao/otp,legoscia/otp,jj1bdx/otp,kvakvs/otp,vinoski/otp,dumbbell/otp,RoadRunnr/otp,uabboli/otp,bsmr-erlang/otp,dgud/otp,erlang/otp,lrascao/otp,ferd/otp,RoadRunnr/otp,getong/otp,vladdu/otp,RoadRunnr/otp,uabboli/otp,uabboli/otp,aboroska/otp,kvakvs/otp,erlang/otp,vladdu/otp,aboroska/otp,electricimp/otp,electricimp/otp,dgud/otp,dumbbell/otp,emacsmirror/erlang,RoadRunnr/otp,rlipscombe/otp,vladdu/otp,bjorng/otp,lrascao/otp,dumbbell/otp,aboroska/otp,jj1bdx/otp,uabboli/otp,RoadRunnr/otp,aboroska/otp,legoscia/otp,g-andrade/otp,uabboli/otp,rlipscombe/otp,potatosalad/otp,bjorng/otp,rlipscombe/otp,jj1bdx/otp,aboroska/otp,aboroska/otp,isvilen/otp,getong/otp,electricimp/otp,potatosalad/otp,dgud/otp,mikpe/otp,ferd/otp,getong/otp,emacsmirror/erlang,RoadRunnr/otp,vinoski/otp,vladdu/otp,uabboli/otp,bjorng/otp,jj1bdx/otp,electricimp/otp,legoscia/otp,dumbbell/otp,bjorng/otp,emacsmirror/erlang,bsmr-erlang/otp,bsmr-erlang/otp,jj1bdx/otp,mikpe/otp,g-andrade/otp,g-andrade/otp,aboroska/otp,dumbbell/otp,electricimp/otp,jj1bdx/otp,rlipscombe/otp,electricimp/otp,lrascao/otp,mikpe/otp,rlipscombe/otp,potatosalad/otp,isvilen/otp,dumbbell/otp,isvilen/otp,mikpe/otp,dgud/otp,emacsmirror/erlang,bjorng/otp,g-andrade/otp,bsmr-erlang/otp,dumbbell/otp,lrascao/otp,electricimp/otp,jj1bdx/otp,dgud/otp,potatosalad/otp,bsmr-erlang/otp,vladdu/otp,aboroska/otp,uabboli/otp,mikpe/otp,vinoski/otp,legoscia/otp,legoscia/otp,legoscia/otp,isvilen/otp,mikpe/otp,g-andrade/otp,isvilen/otp,g-andrade/otp,legoscia/otp,jj1bdx/otp,mikpe/otp,kvakvs/otp,isvilen/otp,jj1bdx/otp,bjorng/otp,ferd/otp,dumbbell/otp,electricimp/otp,emacsmirror/erlang,vinoski/otp,isvilen/otp,emacsmirror/erlang,rlipscombe/otp,bjorng/otp,vladdu/otp,vinoski/otp,dgud/otp,vinoski/otp,dgud/otp,erlang/otp,lrascao/otp,ferd/otp,ferd/otp,legoscia/otp,erlang/otp,erlang/otp,kvakvs/otp,potatosalad/otp,dgud/otp,dgud/otp,getong/otp,getong/otp,emacsmirror/erlang,vladdu/otp,dumbbell/otp,mikpe/otp,dumbbell/otp,rlipscombe/otp,lrascao/otp,kvakvs/otp,mikpe/otp,bsmr-erlang/otp,uabboli/otp