(change_password): handle that printf("%.*s", 0, (void*)NULL); doesn't

work on solaris


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@13326 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/krb5/init_creds_pw.c

@@ -438,7 +438,7 @@ change_password (krb5_context context,
     asprintf (&p, "%s: %.*s\n",
 	      result_code ? "Error" : "Success",
 	      (int)result_string.length,
-	      (char*)result_string.data);
+	      result_string.length > 0 ? (char*)result_string.data : "");
 
     ret = (*prompter) (context, data, NULL, p, 0, NULL);
     free (p);