Another patch from FS#10633 by Michael Sparmann (with a couple of minor cosmetic tweaks by me) - cleanly unmount the flash when powering off or rebooting.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22920 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/s5l8700/ipodnano2g/power-nano2g.c

@@ -23,6 +23,10 @@
 #include "inttypes.h"
 #include "s5l8700.h"
 #include "power.h"
+#include "ftl-target.h"
+#include <string.h>
+#include "panic.h"
+
 
 /*  Power handling for S5L8700 based Meizu players
 
@@ -32,7 +36,10 @@
 
 void power_off(void)
 {
-    /* TODO */
+    if (ftl_sync() != 0) panicf("Failed to unmount flash!");
+
+    /* TODO: Really power-off */
+    panicf("Poweroff not implemented yet.");
     while(1);
 }