libXi XGetExtensionVersion does not release lock when extension is not present

[Magnus Kessler]

Even after the recent changes to libXi's lock handling there is still a case 
where the lock is not correctly freed. This happens when the XInput 
extension is not available on the server.

I have opened bug #8663 (https://bugs.freedesktop.org/show_bug.cgi?id=8663) 
for this and attached a rather large patch to it that attempts to clean up 
the lock handling in libXi. The patch removes all lock-related side effects 
from internal functions and also gets rid of the recursive calls between 
_XiCheckExtInit() and _XiGetExtensionVersion().

Please review and apply to the tree if appropriate.

Thanks,

Magnus Kessler
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