fixup! Optimize expand to avoid one unecessary sdiv

Author: vchuravy

src/nditeration.jl

@@ -93,7 +93,7 @@ Base.@propagate_inbounds function expand(ndrange::NDRange{N}, groupidx::Integer,
         w = W.indices[I]
         length(b) * length(w)
     end
-    CartesianIndices(Ind)[(groupidx-1)* prod(size(B)) + idx]
+    CartesianIndices(Ind)[(groupidx-1)* prod(size(W)) + idx]
 end
 
 Base.@propagate_inbounds function expand(ndrange::NDRange{N}, groupidx::CartesianIndex{N}, idx::Integer) where {N}