Avoid script/bench-go-gif variable shadowing
diff --git a/script/bench-go-gif/main.go b/script/bench-go-gif/main.go
index d79cb76..c368ff7 100644
--- a/script/bench-go-gif/main.go
+++ b/script/bench-go-gif/main.go
@@ -117,7 +117,7 @@
 			if err != nil {
 				return err
 			}
-			for i := uint64(1); i < iters; i++ {
+			for j := uint64(1); j < iters; j++ {
 				decode(src, bgra)
 			}