missing return in bridge sysfs code

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

net/bridge/br_sysfs_br.c

@@ -167,6 +167,7 @@ static ssize_t store_stp_state(struct device *d,
 	br_stp_set_enabled(br, val);
 	rtnl_unlock();
 
+	return len;
 }
 static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
 		   store_stp_state);