fix crash in oggzinfo if a skeleton track refers to a track not found in the physical stream (while a skeleton track like this is moderately useful, it can happen if you demux tracks and oggzinfo each of them). Patch by ogg.k.ogg.k
fix crash in oggzinfo if a skeleton track refers to a track not
found in the physical stream (while a skeleton track like this is
moderately useful, it can happen if you demux tracks and oggzinfo each
of them). Patch by ogg.k.ogg.k


git-svn-id: ed696e516b63563c8842837a624e30c98be77b3c@3509 8158c8cd-e7e1-0310-9fa4-c5954c97daef

kfish/liboggz,brion/liboggz,kfish/liboggz,brion/liboggz,brion/liboggz,kfish/liboggz,brion/liboggz