Fix build_routing_packet

Author: Takahiro-Yoko

modules/exploits/linux/http/empire_skywalker.rb

@@ -374,8 +374,7 @@ def build_routing_packet(staging_key, meta = 0, enc_data = ''.b, session_id = '0
     rc4_iv = SecureRandom.random_bytes(4)
     key = rc4_iv + staging_key
     rc4_enc_data = Rex::Crypto.rc4(key, data)
-    packet = rc4_iv + rc4_enc_data + enc_data
-    packet
+    rc4_iv + rc4_enc_data + enc_data
   end
 
   def aes_encrypt_then_hmac(key, data)