Check the correct variable for null after allocating the server string
in rtree_capath_vals.


https://github.com/krb5/krb5/commit/a325faadc86039d4e6ec876f49319251eb7afbc8
Commit By: ghudson
Revision: 21980
Changed Files:
U   trunk/src/lib/krb5/krb/walk_rtree.c