Avoid crashing on bad input.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@16980 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/hx509/crypto.c

@@ -915,6 +915,7 @@ _hx509_parse_private_key(const heim_oid *key_oid,
     ret = (*md->parse_private_key)(md, data, len, *private_key);
     if (ret)
 	_hx509_free_private_key(private_key);
+    else
 	(*private_key)->md = md;
 
     return ret;