[MPlayer-dev-eng] buffer overrun in mp_input_parse_config

[Martynas Venckus]

Hi,

A few people have been running with the GCC stack fence diff I came up
with, which puts a fence between each buffer (rather than the last one
as stack protector does).

Mplayer has been crashing since due to a buffer overrun in
mp_input_parse_config() which always does buffer[-1] = '\0' at the
very end.  The following fixes it and I think is what was intended.

Cheers,
Martynas.
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