* Returns the first output which is active.
*
*/
-Output *get_first_output() {
+Output *get_first_output(void) {
Output *output;
TAILQ_FOREACH(output, &outputs, outputs)
* (Re-)queries the outputs via RandR and stores them in the list of outputs.
*
*/
-void randr_query_outputs() {
+void randr_query_outputs(void) {
Output *output, *other, *first;
xcb_randr_get_output_primary_cookie_t pcookie;
xcb_randr_get_screen_resources_current_cookie_t rcookie;