sync before umount

package/base-files/src/etc/rc.shutdown

@@ -1,5 +1,6 @@
 #!/bin/sh
+cd /
+sync
 for i in $(grep -v ^# /etc/fstab 2>/dev/null|awk '{ print $2 }');do
-	printf Unmounting $i
-	umount $i
+	umount $i 2>/dev/null
 done