(add_one_principal): `password' can cactually be NULL in the overwrite

code, check for it.


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@7070 ec53bebd-3082-4978-b11e-865c3cabbd6b

kadmin/ank.c

@@ -169,6 +169,7 @@ out:
 	krb5_free_principal (context, princ_ent);
     if(default_ent)
 	kadm5_free_principal_ent (context, default_ent);
+    if (password != NULL)
 	memset (password, 0, strlen(password));
     return ret;
 }