indmanager: Use proper mutex error checking
Things are bit harsh in the indication manager when it comes to cancellation.
At certain situation we force-cancel the polling thread, having no chance
for cleanup. The mutex we use to protect memory shared between threads may
be left in undefined state.
The pthread_mutex_unlock() call in im_stop_ind() may be called on already
unlocked mutex which, in default setup, causes a segfault. Setting a mutex
attribute PTHREAD_MUTEX_ERRORCHECK will prevent this, returning proper error.
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