Fix memory leaks and double frees in preauth2.c


To generate a diff of this commit:



	cvs diff -r1.359 -r1.360 krb5/src/include/ChangeLog
	cvs diff -r1.140 -r1.141 krb5/src/include/k5-int.h
	cvs diff -r5.392 -r5.393 krb5/src/lib/krb5/krb/ChangeLog
	cvs diff -r5.21 -r5.22 krb5/src/lib/krb5/krb/copy_data.c
	cvs diff -r5.102 -r5.103 krb5/src/lib/krb5/krb/get_in_tkt.c
	cvs diff -r5.24 -r5.25 krb5/src/lib/krb5/krb/preauth2.c