Input: serio_raw - signal EFAULT even if read/write partially succeeds

Input: serio_raw - signal EFAULT even if read/write partially succeeds

When copy_to/from_user fails in the middle of transfer we should not
report to the user that read/write partially succeeded but rather
report -EFAULT right away, so that application will know that it got
its buffers all wrong.

If application messed up its buffers we can't trust the data fetched
from userspace and successfully written to the device or if data read
from the device and transferred to userspace ended up where application
expected it to end.

If serio_write() fails we still going to report partial writes if failure
happens in the middle of the transfer.

This is basically a revert of 98804a8ff7df2873cf2b6ea3234599b5062b6605
and 5e5f57022ba9461654396a44573e2c60d8f15745.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>