[NET]: sparse warning fixes

Fix a bunch of sparse warnings. Mostly about 0 used as
NULL pointer, and shadowed variable declarations.
One notable case was that hash size should have been unsigned.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 3 deletions

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index ad500a43b359..2b6e59c4c0d0 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1695,8 +1695,8 @@ static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
 #ifdef CONFIG_IP_MULTICAST
-                struct in_device *in_dev = pmc->interface;
                 struct ip_sf_list *psf;
+                in_dev = pmc->interface;
 #endif
 
                 /* filter mode change */
@@ -1799,7 +1799,7 @@ static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
 {
         int err;
 
-        if (iml->sflist == 0) {
+        if (iml->sflist == NULL) {
                 /* any-source empty exclude case */
                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
                         iml->sfmode, 0, NULL, 0);
@@ -2167,7 +2167,6 @@ int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
                 return -EFAULT;
         }
         for (i=0; i<copycount; i++) {
-                struct sockaddr_in *psin;
                 struct sockaddr_storage ss;
 
                 psin = (struct sockaddr_in *)&ss;