Added test for non existent file for iptcembed

Author: mbniebergall

ext/standard/tests/image/iptcembed_003.phpt

@@ -0,0 +1,12 @@
+--TEST--
+iptcembed() unable to open file
+--CREDITS--
+Mark Niebergall <mbniebergall@gmail.com>
+PHP TestFest 2017 - UPHPU
+--FILE--
+<?php
+var_dump(iptcembed(-1, __DIR__ . '/iptcembed/DOES_NOT_EXIST.ERR', -1));
+?>
+--EXPECTF--
+Warning: iptcembed(): Unable to open %s in %s on line %d
+bool(false)