avformat/cinedec: remove redundant zero termination

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/cinedec.c

@@ -75,7 +75,6 @@ static int set_metadata_int(AVDictionary **dict, const char *key, int value)
     if (value) {
         char buf[64];
         snprintf(buf, sizeof(buf), "%i", value);
-        buf[sizeof(buf) - 1] = 0;
         return av_dict_set(dict, key, buf, 0);
     }
     return 0;