acl: Realign struct posix_acl to save 8 bytes

Reduce posix_acl's struct size by 8 bytes by realigning its members.

Cc: Christian Brauner <brauner@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Link: https://lore.kernel.org/r/20241015202158.2376-1-thorsten.blum@linux.dev
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: toblux

include/linux/posix_acl.h

@@ -28,8 +28,8 @@ struct posix_acl_entry {
 
 struct posix_acl {
 	refcount_t		a_refcount;
-	struct rcu_head		a_rcu;
 	unsigned int		a_count;
+	struct rcu_head		a_rcu;
 	struct posix_acl_entry	a_entries[];
 };