lib: unify process_directory()

remove `lo' check from process_directory() and force net callers
to check for passed d_name. since process_directory() called
from different sites `lo' check is overhead.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
alsa: use process_directory()

use process_directory() helper

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
calibrate: use process_directory()

use process_directory() helper

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
network: use updated process_directory()

check for passed `lo' d_name

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
rfkill: use process_directory()

use process_directory() helper

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
usb: use process_directory()

use process_directory() helper

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
tuning ethernet: use updated process_directory()

check for `lo' d_name in ethtunable_callback()

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
tuningusb: use process_directory()

use process_directory() helper

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>