Embedded server crashes when mysql_library_init called after mysql_library_end

Calling mysql_library_init after a call to mysql_library_end generates a crash.

The crash occurs in the function:
void one_thread_scheduler(scheduler_functions *func,...). On the second call of this function, func is NULL and this is the cause of the crash.

How to reproduce:

• mysql_library_init(...)
• mysql_library_end()
• mysql_library_init(...) --> Crash

It is important to be able to initialize the library several times in order to change the data directory.