Double free corruption in midispcur.c with current git

[Mitch]

Hi,

i just did a recent pull of the Xorg modular sources and rebuilt and am 
seeing double free corruption detected from my glibc the first time i 
log in. Here the stack from the xserver.

The second time the server restarts (via gdm) the login proceeds fine. 
This is 100% reproduceable so any suggestions how i can help to debug is 
more than welcome..

Cheers
M
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