unexport pm_power_off_prepare

This patch removes the unused EXPORT_SYMBOL(pm_power_off_prepare).

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/sys.c b/kernel/sys.c
index 8ae2e63..bc8879c8 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -105,7 +105,6 @@
  */
 
 void (*pm_power_off_prepare)(void);
-EXPORT_SYMBOL(pm_power_off_prepare);
 
 /*
  *	Notifier list for kernel code which wants to be called