ipmr: use goto to common label instead of opencoding

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 21a6dc7..13e9dd3 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1243,8 +1243,7 @@
 		vif->dev->stats.tx_bytes += skb->len;
 		vif->dev->stats.tx_packets++;
 		ipmr_cache_report(net, skb, vifi, IGMPMSG_WHOLEPKT);
-		kfree_skb(skb);
-		return;
+		goto out_free;
 	}
 #endif