avformat/matroskadec: Reindent after the previous commit

Reviewed-by: Ridley Combs <rcombs@rcombs.me>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavformat/matroskadec.c

@@ -1007,7 +1007,7 @@ static int ebml_read_ascii(AVIOContext *pb, int size,
             return AVERROR(ENOMEM);
     } else {
         /* EBML strings are usually not 0-terminated, so we allocate one
-     * byte more, read the string and NULL-terminate it ourselves. */
+         * byte more, read the string and NUL-terminate it ourselves. */
         if (!(res = av_malloc(size + 1)))
             return AVERROR(ENOMEM);
         if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {