[Bugfix] sys_fs: Fixed sys_fs_unlink()'s failing to delete files in dev_usbXXX & Misc syscall implementation fixups #14939
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sys_fs_unlink() used to fail to delete files in dev_usbXXX because it used
mp->root
, which is always "dev_usb" for all dev_usbXXX devices, as argumentdev_root
passed tovfs::host::unlink()
for further processing.This PR fixed the bug mentioned above.