sparse: netsniff-ng, trafgen: fix remaining time(0) warnings

Those are the last occurences of warnings like:

 netsniff-ng.c:697:48: warning: Using plain integer as NULL pointer
 netsniff-ng.c:726:48: warning: Using plain integer as NULL pointer
 ...

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

2 files changed, 3 insertions, 3 deletions

diff --git a/netsniff-ng.c b/netsniff-ng.c
index 644a351..7b08ed0 100644
--- a/netsniff-ng.c
+++ b/netsniff-ng.c
@@ -694,7 +694,7 @@ static int next_multi_pcap_file(struct ctx *ctx, int fd)
 	close(fd);
 
 	slprintf(fname, sizeof(fname), "%s/%s%lu.pcap", ctx->device_out,
-		 ctx->prefix ? : "dump-", time(0));
+		 ctx->prefix ? : "dump-", time(NULL));
 
 	fd = open_or_die_m(fname, O_RDWR | O_CREAT | O_TRUNC |
 			   O_LARGEFILE, DEFFILEMODE);
@@ -723,7 +723,7 @@ static int begin_multi_pcap_file(struct ctx *ctx)
 		ctx->device_out[strlen(ctx->device_out) - 1] = 0;
 
 	slprintf(fname, sizeof(fname), "%s/%s%lu.pcap", ctx->device_out,
-		 ctx->prefix ? : "dump-", time(0));
+		 ctx->prefix ? : "dump-", time(NULL));
 
 	fd = open_or_die_m(fname, O_RDWR | O_CREAT | O_TRUNC |
 			   O_LARGEFILE, DEFFILEMODE);
diff --git a/trafgen.c b/trafgen.c
index a370333..2e32f09 100644
--- a/trafgen.c
+++ b/trafgen.c
@@ -865,7 +865,7 @@ static unsigned int generate_srand_seed(void)
 
 	fd = open("/dev/urandom", O_RDONLY);
 	if (fd < 0)
-		return time(0);
+		return time(NULL);
 
 	read_or_die(fd, &_seed, sizeof(_seed));