virtio_net: Fix memory leak in virtnet_rx_mod_work

The pointer delcaration was missing the __free(kfree).

Fixes: ff7c7d9f ("virtio_net: Remove command data from control_buf")
Reported-by: Jens Axboe <axboe@kernel.dk>
Closes: https://lore.kernel.org/netdev/0674ca1b-020f-4f93-94d0-104964566e3f@kernel.dk/Signed-off-by: Daniel Jurgens <danielj@nvidia.com>
Tested-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/r/20240509183634.143273-1-danielj@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/virtio_net.c

@@ -2862,7 +2862,6 @@ static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
 
 static int virtnet_close(struct net_device *dev)
 {
-	u8 *promisc_allmulti  __free(kfree) = NULL;
 	struct virtnet_info *vi = netdev_priv(dev);
 	int i;
 
@@ -2883,11 +2882,11 @@ static void virtnet_rx_mode_work(struct work_struct *work)
 {
 	struct virtnet_info *vi =
 		container_of(work, struct virtnet_info, rx_mode_work);
+	u8 *promisc_allmulti  __free(kfree) = NULL;
 	struct net_device *dev = vi->dev;
 	struct scatterlist sg[2];
 	struct virtio_net_ctrl_mac *mac_data;
 	struct netdev_hw_addr *ha;
-	u8 *promisc_allmulti;
 	int uc_count;
 	int mc_count;
 	void *buf;