bql: Fix inconsistency between file mode and attr method.

There is no store() method for inflight attribute in the
tx-<n>/byte_queue_limits sysfs directory.
So remove S_IWUSR bit.

Signed-off-by: Hiroaki SHIMODA <shimoda.hiroaki@gmail.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/net-sysfs.c

@@ -929,7 +929,7 @@ static ssize_t bql_show_inflight(struct netdev_queue *queue,
 }
 
 static struct netdev_queue_attribute bql_inflight_attribute =
-	__ATTR(inflight, S_IRUGO | S_IWUSR, bql_show_inflight, NULL);
+	__ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
 
 #define BQL_ATTR(NAME, FIELD)						\
 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,		\