godash: remove assigned but unused start var

Change-Id: I4c99ca26d7a6a5d4941fb764937f54bdd6cd5b99
Reviewed-on: https://go-review.googlesource.com/34974
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

godash/godash.go

@@ -121,7 +121,6 @@ func (d *Data) FetchData(ctx context.Context, gh *github.Client, ger *gerrit.Cli
 			return err
 		}
 		log("Fetched %d closed issues in %.3f seconds", len(res2), time.Now().Sub(start).Seconds())
-		start = time.Now()
 		res = append(res, res2...)
 		for _, issue := range res {
 			d.Issues[issue.Number] = issue