Under low memory conditions (or when testing memory allocation failures), 
the key pointer will be 0 - and not initialized. Test and return failure
before deref a NULL.



https://github.com/krb5/krb5/commit/97b6d19bc89c8eb6754225875890e0f2dbdd929d
Commit By: epeisach
Revision: 24292
Changed Files:
U   trunk/src/lib/crypto/krb/yarrow/ycipher.c