Precise update to v3.8.13.23 stable release

SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from Linus' tree or in a minimally
       backported form of that patch. The v3.8.13.23 upstream stable
       patch set is now available. It should be included in the Ubuntu
       kernel as well.

       git://git.kernel.org/

    TEST CASE: TBD

       The following patches are in the v3.8.13.23 stable release:
Linux 3.8.13.23
floppy: don't write kernel-only members to FDRAWCMD ioctl output
floppy: ignore kernel-only members in FDRAWCMD ioctl input
n_tty: Fix n_tty_write crash when echoing in raw mode