remove duplicate include in trpc.c

src/rpc/src/trpc.c

@@ -25,7 +25,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <string.h>
 #include <sys/socket.h>
 #include <sys/time.h>
 #include <sys/types.h>
@@ -36,7 +35,6 @@
 #include "taosmsg.h"
 #include "tidpool.h"
 #include "tlog.h"
-#include "tlog.h"
 #include "tmd5.h"
 #include "tmempool.h"
 #include "trpc.h"
@@ -46,7 +44,6 @@
 #include "ttcpserver.h"
 #include "ttime.h"
 #include "ttimer.h"
-#include "ttimer.h"
 #include "tudp.h"
 #include "tutil.h"