misc: fix multiple NULL pointer sparse warnings

Those are fixes for the following warnings:

 pcap_mm.c:119:29: warning: Using plain integer as NULL pointer
 pcap_mm.c:141:29: warning: Using plain integer as NULL pointer
 ring.c:24:31: warning: Using plain integer as NULL pointer
 flowtop.c:1114:22: warning: Using plain integer as NULL pointer
 ifpps.c:1133:29: warning: Using plain integer as NULL pointer

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/ifpps.c b/ifpps.c
index ea98ca2..6742dd7 100644
--- a/ifpps.c
+++ b/ifpps.c
@@ -1130,7 +1130,7 @@ static void term_csv(const char *ifname, const struct ifstat *rel,
 {
 	int cpus, i;
 
-	printf("%ld ", time(0));
+	printf("%ld ", time(NULL));
 
 	printf("%llu ", rel->rx_bytes);
 	printf("%llu ", rel->rx_packets);