iscsi class: Fix freeing of skb in get host error path

If get_host_stats failes we are using kfree to free the
skb. We should be using kfree_skb.

This patch was made over Christoph's scsi-queue drivers-for-3.17 branch.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/scsi/scsi_transport_iscsi.c

@@ -3468,7 +3468,7 @@ iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
 
 		err = transport->get_host_stats(shost, buf, host_stats_size);
 		if (err) {
-			kfree(skbhost_stats);
+			kfree_skb(skbhost_stats);
 			goto exit_host_stats;
 		}