Unreachable code for signal unblock in create function for threads

[marirsg2]

in gtthread_sched.c , function gtthread_create, line 190
the code sigprocmask(SIG_UNBLOCK, &sigmaskset, NULL);
is unreachable and the function will always return before it.

fix: move the unblock code into the end of the preceeding if statement, AND the else statement.
This is one of the joys of having mid function return statements :-)

otherwise, I enjoyed reading your code very much. It helped a lot. Go Federer !