remove more warnings

keyboards/ergodox/keymaps/coderkun_neo2/keymap.c

@@ -312,6 +312,8 @@ uint16_t hex_to_keycode(uint8_t hex)
         return NEO_E;
       case 0xF:
         return NEO_F;
+      default:
+        return KC_NO;
     }
   }
 }

keyboards/ergodox/keymaps/twey/keymap.c

@@ -205,6 +205,7 @@ void matrix_init_user(void) {
 
 // Runs constantly in the background, in a loop.
 void matrix_scan_user(void) {
+    __attribute__ ((unused))
     uint32_t layer0 = layer_state & (1UL << 0),
              layer1 = layer_state & (1UL << 1),
              layer2 = layer_state & (1UL << 2),