[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>
diff --git a/net/ipv4/inet_lro.c b/net/ipv4/inet_lro.c
index 20bc593..4545b64 100644
--- a/net/ipv4/inet_lro.c
+++ b/net/ipv4/inet_lro.c
@@ -482,7 +482,7 @@
 
 		lro_init_desc(lro_desc, skb, iph, tcph, 0, NULL);
 		LRO_INC_STATS(lro_mgr, aggregated);
-		return 0;
+		return NULL;
 	}
 
 	if (lro_desc->tcp_next_seq != ntohl(tcph->seq))