oggenc: Set the right AVOption size for the pref_duration option

On big endian machines, the default value set via the faulty
AVOption ended up as 2^32 times too big.

This fixes the fate-lavf-ogg test which currently is broken on
big endian machines, broken since 38313626. Since that commit,
a final zero-sized packet is written to the ogg muxer in that test,
which caused different flushing behaviour on little and big endian
depending on whether the pref_duration option was handled as it
should or not.

CC: libav-stable@libav.org
Signed-off-by: NMartin Storsjö <martin@martin.st>

libavformat/oggenc.c

@@ -80,7 +80,7 @@ static const AVOption options[] = {
     { "pagesize", "preferred page size in bytes (deprecated)",
         OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },
     { "page_duration", "preferred page duration, in microseconds",
-        OFFSET(pref_duration), AV_OPT_TYPE_INT, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
+        OFFSET(pref_duration), AV_OPT_TYPE_INT64, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
     { NULL },
 };