The first printf also has this problem:
if hour, min or sec is >= 100 we can overflow duration_str

Also use %u for hours as it can be >= 100

In file included from ./bitstream/dvb/si_print.h:35:0,
                 from dvb_print_si.c:42:
dvb_print_si.c: In function ‘handle_section’:
./bitstream/dvb/si/eit_print.h:108:42: warning: ‘%02d’ directive writing between 2 and 3 bytes into a region of size between 2 and 4 [-Wformat-overflow=]
         sprintf(duration_str, "%02d:%02d:%02d", hour, min, sec);
                                          ^~~~
./bitstream/dvb/si/eit_print.h:108:31: note: directive argument in the range [0, 165]
         sprintf(duration_str, "%02d:%02d:%02d", hour, min, sec);
                               ^~~~~~~~~~~~~~~~
In file included from /usr/include/stdio.h:862:0,
                 from dvb_print_si.c:33:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:33:10: note: ‘__builtin___sprintf_chk’ output between 9 and 12 bytes into a destination of size 10
   return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       __bos (__s), __fmt, __va_arg_pack ());
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~