tree cbf1b24c148838c9d0476271c520db7e43a15354
parent 7770ea82d5772612f6ae9afc2a1b931079bd4eb0
author Janos Follath <janos.follath@arm.com> 1474877744 +0100
committer Simon Butcher <simon.butcher@arm.com> 1476228737 +0100

Add safety check to sample mutex implementation

Due to inconsistent freeing strategy in pkparse.c the sample mutex
implementation in threading.c could lead to undefined behaviour by
destroying the same mutex several times.

This fix prevents mutexes from being destroyed several times in the
sample threading implementation.