Remove dead code.
Remove dead code.

If fLeafCount is a nullptr, then an offset array will not be requested.
Hence, we remove the code corresponding to this use case.

zzxuanyuan/root,root-mirror/root,karies/root,karies/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,olifre/root,olifre/root,zzxuanyuan/root,zzxuanyuan/root,zzxuanyuan/root,zzxuanyuan/root,olifre/root,zzxuanyuan/root,zzxuanyuan/root,karies/root,zzxuanyuan/root,root-mirror/root,karies/root,olifre/root,karies/root,root-mirror/root,olifre/root,karies/root,olifre/root,karies/root,root-mirror/root,karies/root,root-mirror/root,zzxuanyuan/root,zzxuanyuan/root,karies/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,zzxuanyuan/root,zzxuanyuan/root