Code clean up

Author: plokhotnyuk

jsoniter-scala-macros/shared/src/main/scala-3/com/github/plokhotnyuk/jsoniter_scala/macros/JsonCodecMaker.scala

@@ -2375,9 +2375,9 @@ object JsonCodecMaker {
                 while ({
                   val v = $readVal
                   if (v < 0 || v >= ${Expr(cfg.bitSetValueLimit)}) $in.decodeError("illegal value for bit set")
-                  val xi = v >>> 6
-                  if (xi >= x.length) x = java.util.Arrays.copyOf(x, java.lang.Integer.highestOneBit(xi) << 1)
-                  x(xi) = x(xi) | 1L << v
+                  val i = v >>> 6
+                  if (i >= x.length) x = java.util.Arrays.copyOf(x, java.lang.Integer.highestOneBit(i) << 1)
+                  x(i) = x(i) | 1L << v
                   $in.isNextToken(',')
                 }) ()
                 if ($in.isCurrentToken(']')) ${