sysfs.h: don't return a void-valued expression in sysfs_remove_file

Sparse was complaining about that:
include/linux/sysfs.h:432:9: warning: returning void-valued expression
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/sysfs.h

@@ -437,7 +437,7 @@ static inline int __must_check sysfs_create_file(struct kobject *kobj,
 static inline void sysfs_remove_file(struct kobject *kobj,
 				     const struct attribute *attr)
 {
-	return sysfs_remove_file_ns(kobj, attr, NULL);
+	sysfs_remove_file_ns(kobj, attr, NULL);
 }
 
 static inline int sysfs_rename_link(struct kobject *kobj, struct kobject *target,