[PATCH 4/6] Do not call _xend if no transaction is active.

[Dominik Vogt]

If pthread_mutex_unlock is called without the futex locked and no transaction
open does not necessarily mean that pthread_mutex_lock has not been called.
The transaction may have been closed in third party code.  While this _may_ be
a bug in the software as a whole, unlock should not crash the program.

Overall it is problematic to close transactions if you are not completely sure
that you have opened the transaction yourself.  I see no general solution for
this except installing coding rules for transactional code.

Fix a whitespace error as a side effect.

Ciao

Dominik ^_^  ^_^

-- 

Dominik Vogt
IBM Germany
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