Fix code warning.

Change-Id: Ib11fb49f528d3688351ae349d5b4e307c28b3967
diff --git a/mbtk/libmbtk_lib/net/mbtk_ifc.c b/mbtk/libmbtk_lib/net/mbtk_ifc.c
index 51267f5..3a7b24b 100755
--- a/mbtk/libmbtk_lib/net/mbtk_ifc.c
+++ b/mbtk/libmbtk_lib/net/mbtk_ifc.c
@@ -152,6 +152,7 @@
     return ret;
 }
 
+#if 0
 /* deprecated - v4 only */
 static int ifc_create_default_route2(const char *name, const char *gw)
 {
@@ -175,6 +176,7 @@
     LOGD("ifc_create_default_route(%s) = %d", name, ret);
     return ret;
 }
+#endif
 
 int mbtk_ifc_open(void)
 {
@@ -572,6 +574,6 @@
 
     LOGD("Set IPv6 : %s success.", ipv6);
 exit:
-    close(socket);
+    mbtk_close(sockfd);
     return err;
 }