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>

1 files changed, 1 insertions, 1 deletions

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));