glx: drop obsolete _XUnlock_Mutex in __glXInitialize error path

With commit 1f1928db001(glx: Drop _Xglobal_lock while we create and
initialize glx display) we've split the big _Xglobal_lock handling in
a more fine grained manner.

Unfortunatelly we forgot to drop the unlock_mutex on the error paths,
leading to undefined behaviour as the mutex is already unlocked.

Cc: Kristian Høgsberg <[email protected]>
Cc: "9.2 10.0 10.1"  <[email protected]>
Signed-off-by: Emil Velikov <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

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