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>

4 files changed, 5 insertions, 5 deletions

diff --git a/flowtop.c b/flowtop.c
index b9d32cc..3e55079 100644
--- a/flowtop.c
+++ b/flowtop.c
@@ -1111,7 +1111,7 @@ static void *collector(void *null)
 	flow_list_destroy(&flow_list);
 	nfct_close(handle);
 
-	pthread_exit(0);
+	pthread_exit(NULL);
 }
 
 int main(int argc, char **argv)
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);
diff --git a/pcap_mm.c b/pcap_mm.c
index ea74034..952f872 100644
--- a/pcap_mm.c
+++ b/pcap_mm.c
@@ -116,7 +116,7 @@ static void __pcap_mm_prepare_access_wr(int fd, bool jumbo)
 	if (ret != 1)
 		panic("Cannot write file!\n");
 
-	ptr_va_start = mmap(0, map_size, PROT_WRITE, MAP_SHARED, fd, 0);
+	ptr_va_start = mmap(NULL, map_size, PROT_WRITE, MAP_SHARED, fd, 0);
 	if (ptr_va_start == MAP_FAILED)
 		panic("mmap of file failed!");
 	ret = madvise(ptr_va_start, map_size, MADV_SEQUENTIAL);
@@ -138,7 +138,7 @@ static void __pcap_mm_prepare_access_rd(int fd)
 		panic("pcap dump file is not a regular file!\n");
 
 	map_size = sb.st_size;
-	ptr_va_start = mmap(0, map_size, PROT_READ, MAP_SHARED | MAP_LOCKED, fd, 0);
+	ptr_va_start = mmap(NULL, map_size, PROT_READ, MAP_SHARED | MAP_LOCKED, fd, 0);
 	if (ptr_va_start == MAP_FAILED)
 		panic("mmap of file failed!");
 	ret = madvise(ptr_va_start, map_size, MADV_SEQUENTIAL);
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");