made rscan port optional

source/rscan.src

@@ -1,13 +1,13 @@
-if params.len < 2 or params[0] == "-h" or params[0] == "--help" then
+if params.len < 1 or params[0] == "-h" or params[0] == "--help" then
 	current_program = get_shell.host_computer.File(program_path)
 	exit("Usage: "+current_program.name+" <remote ip> [remote port]")
 end if
 mx = include_lib("/lib/metaxploit.so")
 ip = params[0]
-port = params[1].to_int
-if port == 0 then
+if params.len == 1 or port == 0 then
 	sess = mx.net_use(ip)
 else
+	port = params[1].to_int
 	sess = mx.net_use(ip, port)
 end if
 if not sess then