Addressed void* return warning in all keymaps

keyboard/ergodox_ez/keymaps/colemak/keymap.c

@@ -155,12 +155,12 @@ const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
 };
 
 // Runs just one time when the keyboard initializes.
-void * matrix_init_user(void) {
+void matrix_init_user(void) {
 
 };
 
 // Runs constantly in the background, in a loop.
-void * matrix_scan_user(void) {
+void matrix_scan_user(void) {
 
     uint8_t layer = biton32(layer_state);