stage2: fix superfluous returnvoid ZIR
stage2: fix superfluous returnvoid ZIR

andrewrk/zig,zig-lang/zig,raulgrell/zig,zig-lang/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig