java: websocket: Fix calculation of payload length for > 32bit values

Patch taken from <https://github.com/apache/tomcat/commit/1cddae8da4ecb4ac04575d3b5fba2daa2e0c8ead.patch>

[ Subject / message tweak - Andrew ]
Signed-off-by: Andrew Clayton <[email protected]>

Author: markt-asf

src/java/nginx/unit/websocket/WsFrameBase.java

@@ -670,7 +670,7 @@ protected static long byteArrayToLong(byte[] b, int start, int len) throws IOExc
         int shift = 0;
         long result = 0;
         for (int i = start + len - 1; i >= start; i--) {
-            result = result + ((b[i] & 0xFF) << shift);
+            result = result + ((b[i] & 0xFFL) << shift);
             shift += 8;
         }
         return result;