clear clang errors

include/hiload/hiload.h

@@ -24,12 +24,12 @@ int hi_init(unsigned n, const char **enabled_modules);
 /**
  * Frees memory and cleans up
  */
-void hi_deinit();
+void hi_deinit(void);
 
 /**
  * Print a random assortment of information from current state
  */
-void hi_print_module_infos();
+void hi_print_module_infos(void);
 
 /**
  * Reload shared library if it has changed since last reload or init was called