Fix code warning.

Change-Id: Ib11fb49f528d3688351ae349d5b4e307c28b3967
diff --git a/mbtk/libmbtk_lib/ftp/mbtk_ftp_at.c b/mbtk/libmbtk_lib/ftp/mbtk_ftp_at.c
index 3541e2b..958b0d0 100755
--- a/mbtk/libmbtk_lib/ftp/mbtk_ftp_at.c
+++ b/mbtk/libmbtk_lib/ftp/mbtk_ftp_at.c
@@ -11,7 +11,7 @@
 #include "mbtk_sock.h"
 #include "mbtk_str.h"
 #include "mbtk_sock2.h"
-#include<linux/msg.h>
+#include <sys/msg.h>
 
 /*************************************************************
  typedef struct:local at
@@ -38,7 +38,7 @@
 /*************************************************************
  Variables:local
  *************************************************************/
-static list_node_t *ftp_client_list = NULL;
+// static list_node_t *ftp_client_list = NULL;
 
 /*************************************************************
  Variables:public
@@ -328,7 +328,7 @@
 void mbtk_at_ftp_data_cb(void *data, uint32 data_len)
 {
     char resp_buf[2150];
-    printf("\n=====data_cb data[%s]=====\n=====data_cb data_len[%d]=====\n",data, data_len);
+    printf("\n=====data_cb data[%s]=====\n=====data_cb data_len[%d]=====\n",(char*)data, data_len);
 
     memset(resp_buf,0,2150);
     sprintf(resp_buf, "+CFTPGET:");
@@ -370,7 +370,7 @@
 {
 
     int at_ftp_ret=-1;
-    int len_size;
+//    int len_size;
 
     mbtk_at_ftp_par_at.at_ftp_handle = mbtk_ftp_init(mbtk_at_ftp_par_at.host, mbtk_at_ftp_par_at.port, mbtk_at_ftp_par_at.auth_type,
                                     0, mbtk_at_ftp_par_at.use_cert);
@@ -399,7 +399,7 @@
     uint32 len;
     int download_time = 0;
     char resp_buf[1024];
-    int ret;
+//    int ret;
 
     uint32 file_size = mbtk_ftp_file_size(mbtk_at_ftp_par_at.at_ftp_handle, remote_path);
     if(file_size > 0)
@@ -510,7 +510,7 @@
 
 void ftp_ls_at_cb_func(void *file_list_cb)
 {
-    int ret;
+//    int ret;
     char resp_buf[1024 + 1];
     printf("+CFTPLIST:\r\n%s\n", ((mbtk_ftp_file_info_s *)file_list_cb)->name);
     sprintf(resp_buf, "%s",((mbtk_ftp_file_info_s *)file_list_cb)->name);
@@ -522,7 +522,7 @@
 int mbtk_at_ftp_list(char *ftp_path)
 {
     int at_ftp_ret=-1;
-    int len_size;
+//    int len_size;
     char resp_buf[1024];
 
     mbtk_at_ftp_par_at.at_ftp_handle = mbtk_ftp_init(mbtk_at_ftp_par_at.host, mbtk_at_ftp_par_at.port, mbtk_at_ftp_par_at.auth_type,