[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, 2 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 2a9b363e820c..307e1f1107ca 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -246,7 +246,7 @@ static spinlock_t	*rt_hash_locks;
 
 static struct rt_hash_bucket    *rt_hash_table;
 static unsigned                 rt_hash_mask;
-static int                      rt_hash_log;
+static unsigned int             rt_hash_log;
 static unsigned int             rt_hash_rnd;
 
 static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat);
@@ -593,7 +593,7 @@ static void rt_check_expire(struct work_struct *work)
                 i = (i + 1) & rt_hash_mask;
                 rthp = &rt_hash_table[i].chain;
 
-                if (*rthp == 0)
+                if (*rthp == NULL)
                         continue;
                 spin_lock_bh(rt_hash_lock_addr(i));
                 while ((rth = *rthp) != NULL) {