Fix build warning about the unused variable in char_dev.c:267

Remove the unused char *s.
Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Cc: Renzo Davoli <renzo@cs.unibo.it>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

fs/char_dev.c

@@ -264,7 +264,6 @@ int __register_chrdev(unsigned int major, unsigned int baseminor,
 {
 	struct char_device_struct *cd;
 	struct cdev *cdev;
-	char *s;
 	int err = -ENOMEM;
 
 	cd = __register_chrdev_region(major, baseminor, count, name);