Fix 2 compiler warnings

FreeBSD 10 32-bit with clang 3.3:
<pre>
log-tlslog.c:172:14: error: format specifies type 'long' but the argument has type 'time_t' (aka 'int') [-Werror,-Wformat]
             p->ts.tv_sec,
             ^~~~~~~~~~~~
1 error generated.

detect-engine-payload.c:508:27: warning: format specifies type 'long' but the argument has type 'time_t' (aka 'int') [-Wformat]
    printf("%ld.%06ld\n", tv_diff.tv_sec, (long int)tv_diff.tv_usec);
            ~~~           ^~~~~~~~~~~~~~
            %d
1 warning generated.
</pre>
Prscript:
- PR build: https://buildbot.suricata-ids.org/builders/inliniac/builds/258
- PR pcaps: https://buildbot.suricata-ids.org/builders/inliniac-pcap/builds/177