My patch to fe-connect.c introduced a new bug which is triggered only, if

My patch to fe-connect.c introduced a new bug which is triggered only, if
Kerberos is being used (attempt to free static memory).
The error was caused by a confusing doublespeak of fe_getauthname():
Returns a pointer to static memory, if you authenticate via Kerberos,
a pointer to dynamic memory otherwise.

Submitted by: Erich Stamberger <eberger@gewi.kfunigraz.ac.at>