Fix the build.

Author: CoolTomatos

httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/AbstractH2StreamMultiplexer.java

@@ -1342,8 +1342,8 @@ void copyPayload(final ByteBuffer payload) {
             if (payload == null) {
                 return;
             }
-            int originalLength = headerBuffer.length();
-            int toCopy = payload.remaining();
+            final int originalLength = headerBuffer.length();
+            final int toCopy = payload.remaining();
             headerBuffer.ensureCapacity(toCopy);
             payload.get(headerBuffer.array(), originalLength, toCopy);
             headerBuffer.setLength(originalLength + toCopy);