Fix bug in DHCP parser: int to byte comaprision.

src/main/java/net/floodlightcontroller/packet/DHCP.java

@@ -361,10 +361,10 @@ public class DHCP extends BasePacket {
         // minimum size 240 including magic cookie, options generally padded to 300
         int optionsLength = 0;
         for (DHCPOption option : this.options) {
-            if (option.getCode() == 0 || option.getCode() == 255) {
+            if (option.getCode() == 0 || option.getCode() == ((byte)255)) {
                 optionsLength += 1;
             } else {
-                optionsLength += 2 + (int)(0xff & option.getLength());
+                optionsLength += 2 + (0xff & option.getLength());
             }
         }
         int optionsPadLength = 0;