[PATCH] Fix crash in net ads keytab create.

[Jeremy Allison]

Bug: https://bugzilla.samba.org/show_bug.cgi?id=11959

The done: label in ads_keytab_create_default() can be
jumped to with krb5_context context = NULL, and then
can use it in krb calls.

Now the code in master is probably safe from this,
as it initializes krb5_kt_cursor cursor = {0};
and krb5_keytab_entry kt_entry = {0}, but it's
very error-prone programming to not check every
referenced pointer before use in error cleanup.

Second Team member review appreciated.

Cheers,

	Jeremy.
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