Actually use the returned value

It seems on Unix, the behaviour is to convert integers into IP
addresses, whereas Windows tries to resolve it. Regardless, it's silly
to test what the type is, since it returns the unmodified hostname if it
can't be resolved, so it'll always be a string, error or not.

Author: NattyNarwhal

ext/standard/tests/network/gethostbyname_error002.phpt

@@ -4,7 +4,7 @@ gethostbyname() function - basic type return error test
 "Sylvain R." <sracine@phpquebec.org>
 --FILE--
 <?php
-    var_dump(is_string(gethostbyname("1234567890")));
+    var_dump(gethostbyname("1234567890"));
 ?>
 --EXPECT--
-bool(true)
+string(12) "73.150.2.210"