[Keymap][CRKBD/SOUNDMONSTER] Fixed compilation (forgot return) (#15554)

keyboards/crkbd/keymaps/soundmonster/keymap.c

@@ -303,7 +303,7 @@ void suspend_power_down_user() {
 bool oled_task_user(void) {
     if (timer_elapsed32(oled_timer) > 30000) {
         oled_off();
-        return;
+        return false;
     }
 #ifndef SPLIT_KEYBOARD
     else { oled_on(); }