Fix code warning.

Change-Id: Ib11fb49f528d3688351ae349d5b4e307c28b3967
diff --git a/mbtk/test/libmbtk_coap/mbtk_coap_test.c b/mbtk/test/libmbtk_coap/mbtk_coap_test.c
index b211913..1d8e9ad 100755
--- a/mbtk/test/libmbtk_coap/mbtk_coap_test.c
+++ b/mbtk/test/libmbtk_coap/mbtk_coap_test.c
@@ -1,4 +1,6 @@
 #include <string.h>
+#include <unistd.h>
+
 #include "mbtk_type.h"
 #include "mbtk_coap.h"
 #include "mbtk_coap_api.h"
@@ -10,9 +12,9 @@
 
 int main(int argc, char *argv[])
 {
-    char operator[10];
-    int opt;
-    int    ret     = -1;
+    //char operator[10];
+  //  int opt;
+//    int    ret     = -1;
 
 	printf("coap_demo star\r\n");
 	coap_get_method();
@@ -26,8 +28,8 @@
 
 int coap_get_method(void)
 {
-	int ret = -1;
-	ret = mbtk_coap_ecoapnew_exec_cmd("134.102.218.18",5683,0,0);    //server ip, port
+//	int ret = -1;
+	mbtk_coap_ecoapnew_exec_cmd("134.102.218.18",5683,0,0);    //server ip, port
 	mbtk_coap_ecoapmsgid_exec_cmd(1);								//set message id
 	mbtk_coap_ecoaptype_exec_cmd(0);								//set message type
 	mbtk_coap_ecoapcode_exec_cmd(1);								//set Get request method
@@ -40,8 +42,8 @@
 
 int coap_post_method(void)
 {
-	int ret = -1;
-	ret = mbtk_coap_ecoapnew_exec_cmd("134.102.218.18",5683,0,0);     //server ip, port
+//	int ret = -1;
+	mbtk_coap_ecoapnew_exec_cmd("134.102.218.18",5683,0,0);     //server ip, port
 	mbtk_coap_ecoapmsgid_exec_cmd(3);            					//set message id
 	mbtk_coap_ecoaptype_exec_cmd(0);             					//set message type
 	mbtk_coap_ecoapcode_exec_cmd(2);			 					//set Post request method