driver core: clean up shutdown.c

shutdown.c had some stuff it did not need, including a duplicate extern
in the power.h file.  This cleans up all of that.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/base/power/power.h

-/*
- * shutdown.c
- */
-
-extern void device_shutdown(void);
-
-
 #ifdef CONFIG_PM_SLEEP
 
 /*

drivers/base/power/shutdown.c

@@ -12,10 +12,6 @@
 #include <asm/semaphore.h>
 
 #include "../base.h"
-#include "power.h"
-
-#define to_dev(node) container_of(node, struct device, kobj.entry)
-
 
 /**
  * We handle system devices differently - we suspend and shut them
@@ -45,4 +41,3 @@ void device_shutdown(void)
 		}
 	}
 }
-