monitor: Only print credentials if PID is set

If PID is not set don't print anything since this is likely a packet
originated by the kernel itself.

diff --git a/monitor/packet.c b/monitor/packet.c
index 9a973d3..de5c068 100755 (executable)
--- a/monitor/packet.c
+++ b/monitor/packet.c
@@ -437,7 +437,7 @@ static void print_packet(struct timeval *tv, struct ucred *cred, char ident,
                        pos += n;
        }
 
-       if (cred) {
+       if (cred && cred->pid) {
                cred_pid(cred, pid_str, sizeof(pid_str));
                n = sprintf(line + pos, "%s: %c %s", pid_str, ident,
                                                label ? label : "");