Use PHP_STREAM_CAST_MASK to mask flags in castas param

Author: Girgias

main/streams/userspace.c

@@ -1384,8 +1384,10 @@ static int php_userstreamop_cast(php_stream *stream, int castas, void **retptr)
 	php_stream * intstream = NULL;
 	int call_result;
 	int ret = FAILURE;
-	bool report_errors = !(castas & PHP_STREAM_FLAG_SUPPRESS_ERRORS);
-	castas &= ~PHP_STREAM_FLAG_SUPPRESS_ERRORS;
+
+	int flags = castas & PHP_STREAM_CAST_MASK;
+    castas &= ~PHP_STREAM_CAST_MASK;
+	bool report_errors = !(flags & PHP_STREAM_FLAG_SUPPRESS_ERRORS);
 
 	ZVAL_STRINGL(&func_name, USERSTREAM_CAST, sizeof(USERSTREAM_CAST)-1);