decrease complexity in public_ip

lib/sparoid.rb

@@ -152,7 +152,7 @@ def write_cache
   def public_ip(host = "checkip.amazonaws.com", port = 80)
     Socket.tcp(host, port, connect_timeout: 3) do |sock|
       sock.sync = true
-      sock.print "GET / HTTP/1.1\r\nHost: #{host}:#{port}\r\nConnection: close\r\n\r\n"
+      sock.print "GET / HTTP/1.1\r\nHost: #{host}\r\nConnection: close\r\n\r\n"
       status = sock.readline(chomp: true)
       raise(ResolvError, "#{host}:#{port} response: #{status}") unless status.start_with? "HTTP/1.1 200 "
 
@@ -162,11 +162,7 @@ def public_ip(host = "checkip.amazonaws.com", port = 80)
           content_length = m[1].to_i
         end
       end
-      ip = if content_length.zero?
-             sock.readline(chomp: true)
-           else
-             sock.read(content_length).chomp
-           end
+      ip = sock.read(content_length).chomp
       Resolv::IPv4.create ip
     end
   end