[MPlayer-dev-eng] [PATCH] to free_demuxer to avoid glibc "double free or corruption" crash

[Mark James]

Attached patch to libmpdemux/demuxer.c in MPlayer-20050806 fixes
glibc-initiated crash with a "double free or corruption" error
when the demuxer is a demuxer-demuxer.

Test of demuxer type was being made after the demuxer was closed
and free-d.  Type test is now made prior to the free, and saved
test result is used after the free.
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