Driver core: fix devres_release_all() return value

Every file should include the headers containing the prototypes for
it's global functions.

Since the GNU C compiler is now able to detect that the function 
prototype of devres_release_all() in the header and the actual function 
disagree regarding the return value, this patch also fixes this bug.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/base/base.h

@@ -44,6 +44,6 @@ struct class_device_attribute *to_class_dev_attr(struct attribute *_attr)
 
 extern char *make_class_name(const char *name, struct kobject *kobj);
 
-extern void devres_release_all(struct device *dev);
+extern int devres_release_all(struct device *dev);
 
 extern struct kset devices_subsys;

drivers/base/devres.c

@@ -10,6 +10,8 @@
 #include <linux/device.h>
 #include <linux/module.h>
 
+#include "base.h"
+
 struct devres_node {
 	struct list_head		entry;
 	dr_release_t			release;