fix the possibility for pthread_detach(0) #2
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Describe your changes
When detaching a thread, there is a certain case where that
pthread_tvariable could be 0. On my system,pthread_detach(0)is causing a segfault, crashing the program. On other systems (and according to the man page), it shouldn't segfault but instead gracefully return an error code, however in that case it is still an error, and I believe it should be fixed in this way, in any case.Issue number and link
#1