datapath: Use NULL for null pointer in compat code.

Fixes a sparse warning on 2.6.18:

datapath/linux-2.6/compat-2.6/include/net/dst.h:12:20: warning: Using plain
integer as NULL pointer

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>

diff --git a/datapath/linux-2.6/compat-2.6/include/net/dst.h b/datapath/linux-2.6/compat-2.6/include/net/dst.h
index e51ac1d..f481a9d 100644 (file)
--- a/datapath/linux-2.6/compat-2.6/include/net/dst.h
+++ b/datapath/linux-2.6/compat-2.6/include/net/dst.h
@@ -9,7 +9,7 @@ static inline void skb_dst_drop(struct sk_buff *skb)
 {
        if (skb->dst)
                dst_release(skb_dst(skb));
-       skb->dst = 0UL;
+       skb->dst = NULL;
 }
 
 #endif