When requesting a cross-realm TGT, use the KDC instance of the current
TGT (the second data component), not the realm which the TGT came
from.

https://github.com/krb5/krb5/commit/5c94d680e4e9cbffa763ad69b112385492fd4ebf
Commit By: ghudson
Revision: 25121
Changed Files:
U   trunk/src/lib/krb5/krb/get_creds.c