mcast: net_device dev not used

ip6_mc_source(), ip6_mc_msfilter() as well as ip6_mc_msfget() declare
and assign dev but do not use the variable afterwards.
Signed-off-by: NHagen Paul Pfeifer <hagen@jauu.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/mcast.c

@@ -319,7 +319,6 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
 {
 	struct in6_addr *source, *group;
 	struct ipv6_mc_socklist *pmc;
-	struct net_device *dev;
 	struct inet6_dev *idev;
 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 	struct ip6_sf_socklist *psl;
@@ -341,7 +340,6 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
 		rcu_read_unlock();
 		return -ENODEV;
 	}
-	dev = idev->dev;
 
 	err = -EADDRNOTAVAIL;
 
@@ -455,7 +453,6 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 {
 	struct in6_addr *group;
 	struct ipv6_mc_socklist *pmc;
-	struct net_device *dev;
 	struct inet6_dev *idev;
 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 	struct ip6_sf_socklist *newpsl, *psl;
@@ -478,7 +475,6 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 		rcu_read_unlock();
 		return -ENODEV;
 	}
-	dev = idev->dev;
 
 	err = 0;
 
@@ -549,7 +545,6 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 	struct in6_addr *group;
 	struct ipv6_mc_socklist *pmc;
 	struct inet6_dev *idev;
-	struct net_device *dev;
 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 	struct ip6_sf_socklist *psl;
 	struct net *net = sock_net(sk);
@@ -566,7 +561,6 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 		rcu_read_unlock();
 		return -ENODEV;
 	}
-	dev = idev->dev;
 
 	err = -EADDRNOTAVAIL;
 	/*