[PATCH net-next 1/3] ipv6: mcast: reduce ipv6_chk_mcast_addr() indentation

[Eric Dumazet <edumazet@google.com>]

Add a label and two gotos to shorten lines by two tabulations,
to ease code review of following patches.

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 net/ipv6/mcast.c | 42 ++++++++++++++++++++++--------------------
 1 file changed, 22 insertions(+), 20 deletions(-)

diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index b244dbf61d5f3969c8886a999166ad5ef68b746d..afe707b6841d1ce84f11cc588200615b504a591d 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1021,29 +1021,31 @@ bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 
 	rcu_read_lock();
 	idev = __in6_dev_get(dev);
-	if (idev) {
-		for_each_mc_rcu(idev, mc) {
-			if (ipv6_addr_equal(&mc->mca_addr, group))
-				break;
-		}
-		if (mc) {
-			if (src_addr && !ipv6_addr_any(src_addr)) {
-				struct ip6_sf_list *psf;
+	if (!idev)
+		goto unlock;
+	for_each_mc_rcu(idev, mc) {
+		if (ipv6_addr_equal(&mc->mca_addr, group))
+			break;
+	}
+	if (!mc)
+		goto unlock;
+	if (src_addr && !ipv6_addr_any(src_addr)) {
+		struct ip6_sf_list *psf;
 
-				for_each_psf_rcu(mc, psf) {
-					if (ipv6_addr_equal(&psf->sf_addr, src_addr))
-						break;
-				}
-				if (psf)
-					rv = psf->sf_count[MCAST_INCLUDE] ||
-						psf->sf_count[MCAST_EXCLUDE] !=
-						mc->mca_sfcount[MCAST_EXCLUDE];
-				else
-					rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
-			} else
-				rv = true; /* don't filter unspecified source */
+		for_each_psf_rcu(mc, psf) {
+			if (ipv6_addr_equal(&psf->sf_addr, src_addr))
+				break;
 		}
+		if (psf)
+			rv = psf->sf_count[MCAST_INCLUDE] ||
+				psf->sf_count[MCAST_EXCLUDE] !=
+				mc->mca_sfcount[MCAST_EXCLUDE];
+		else
+			rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
+	} else {
+		rv = true; /* don't filter unspecified source */
 	}
+unlock:
 	rcu_read_unlock();
 	return rv;
 }
-- 
2.47.0.338.g60cca15819-goog