added checks to prevent segfault error when running openchange provision script

[Anatoliy Atanasov]

Hi Andrew,
 
I have added some code to check the result of dsdb_class_by_lDAPDisplayName in schema_subclasses and schema_create_subclasses in schema_inferiors.c. I’ve found that running the openchange provision script leads to segfaults in these places.
Perhaps this is not the best way to handle this but it works for now.
 
Regards, 
Anatoliy

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