liblogthread, fix fclose race

The mutex in liblogthread protects the list of messages to be printed, but not the FILE*. So the printing thread gets the mutex, takes the entries off the list and then releases it before doing the printing.

It's quite possible that the FILE* has been freed by the calling daemon in this gap, thus causing a daemon segfault when the message comes to be printed

The fclose/fopen code is already protected by the mutex so it seems to be a simple matter of moving the phthread_mutex_unlock() a little later in the print loop.

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