兼容glibc

Change-Id: I7b1361d8f1e3c31c2d94b31b6addc32869dee457
diff --git a/mbtk/test/others/fs_full.c b/mbtk/test/others/fs_full.c
index 88bf28a..cb53e49 100755
--- a/mbtk/test/others/fs_full.c
+++ b/mbtk/test/others/fs_full.c
@@ -7,7 +7,7 @@
 
 int main(int argc, char *argv[])
 {
-    int fd = open("/test.data", O_WRONLY | O_CREAT | O_APPEND);
+    int fd = open("/test.data", O_WRONLY | O_CREAT | O_APPEND, 0666);
     if(fd < 0) {
         printf("open() fail:%d", errno);
         return -1;