cue/build: remove unnecessary duplicate initialized
cue/build: remove unnecessary duplicate initialized

Change-Id: Icce5dae2495c1eacd3afeafac09c40696cd9912b
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/4503
Reviewed-by: Marcel van Lohuizen <a22d082192f3ccf984644a4f482781f4c2d65180@golang.org>

cuelang/cue