[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, 1 insertions, 1 deletions

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index d4d5d2f271d2..9e98c6e567dd 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -592,7 +592,7 @@ static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
         } else
                 handle = gen_new_kid(ht, htid);
 
-        if (tb[TCA_U32_SEL-1] == 0 ||
+        if (tb[TCA_U32_SEL-1] == NULL ||
             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
                 return -EINVAL;