USB: serial: keyspan_pda: fix receive sanity checks
commit c528fcb1 upstream. Make sure to check for short transfers before parsing the receive buffer to avoid acting on stale data. Fixes: 1da177e4 ("Linux-2.6.12-rc2") Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Johan Hovold <johan@kernel.org> [bwh: Backported to 3.2: - Adjust context - Keep the check for !tty in the data case] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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