Merge remote-tracking branch 'stefanha/trivial-patches' into staging

* stefanha/trivial-patches:
  exec.c: Remove out of date comment
  exec.c: Use subpages for large unaligned mappings
  exec.c: Fix off-by-one error in register_subpage
  socket: clean up redundant assignment
  qom: Clean libuser object and dependency files
  usb: Clean common object and dependency files