Make sure configuration is saved to storage device

Bug: 20891664

Change-Id: I9bec042155f13bec678944466082a9969e559851
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/src/utils/os_none.c b/src/utils/os_none.c
index 83fe025..96d243d 100644
--- a/src/utils/os_none.c
+++ b/src/utils/os_none.c
@@ -102,6 +102,12 @@
 }
 
 
+int os_fsync(FILE *stream)
+{
+	return 0;
+}
+
+
 void * os_zalloc(size_t size)
 {
 	return NULL;