feat: implemented liballoc for proper malloc

kernel/drivers/keyboard.c

@@ -38,7 +38,7 @@ char getc() {
         KeyEvent *event = get_next_event();
         char retval = 0;
         if (event == NULL) {
-            goto _getc_end;
+            goto _getc_end_nofree;
         }
         if (event->is_release) {
             goto _getc_end;
@@ -53,6 +53,7 @@ char getc() {
         }
         _getc_end:
         free_event(event);
+        _getc_end_nofree:
         if (retval != 0) {
             return retval;
         }