- Moved NULL check before dereferencing

Author: felipensp

ext/zip/php_zip.c

@@ -102,14 +102,14 @@ static char * php_zip_make_relative_path(char *path, int path_len) /* {{{ */
 	char *path_begin = path;
 	size_t i;
 
-	if (IS_SLASH(path[0])) {
-		return path + 1;
-	}
-
 	if (path_len < 1 || path == NULL) {
 		return NULL;
 	}
 
+	if (IS_SLASH(path[0])) {
+		return path + 1;
+	}
+
 	i = path_len;
 
 	while (1) {