demux_mkv: use a more universal zero initializer

Unfortunately, we can't avoid this warning 100%, because ebml_info is
written by a Perl script. I think the script writes the struct fields in
random order (thanks Perl), so there's no way to know whether the first
struct field is a scalar or a struct.

At least {0} is always valid here, even if it shows a warning. (The
compilers are wrong, see e.g. [1].)

[1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119

0 files changed, 0 insertions, 0 deletions