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/ring.c b/ring.c
index c5d2d99..a227957 100644
--- a/ring.c
+++ b/ring.c
@@ -21,7 +21,7 @@
 
 void mmap_ring_generic(int sock, struct ring *ring)
 {
-	ring->mm_space = mmap(0, ring->mm_len, PROT_READ | PROT_WRITE,
+	ring->mm_space = mmap(NULL, ring->mm_len, PROT_READ | PROT_WRITE,
 			      MAP_SHARED | MAP_LOCKED | MAP_POPULATE, sock, 0);
 	if (ring->mm_space == MAP_FAILED)
 		panic("Cannot mmap {TX,RX}_RING!\n");