[pull] devel from neutrinolabs:devel #97
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Coverity has generated a number of 'Data race condition' and 'Double lock' false positives. A lot of these seem to be caused by the NULL guard in tc_mutex_unlock() not being paired with a NULL guard in tc_mutex_lock(). This PR adds a NULL guard to tc_mutex_lock(). It should be noted, that on Linux at least, passing NULL to tc_mutex_lock() causes a segfault. We clearly aren't doing this at the moment, or we'd know about it. A log message is generated if a NULL call is made, rather than failing silently.
Address Coverity mutex issues
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