staging: ks7010: refactor ks_wlan_translate_scan function

This commit refactors ks_wlan_translate_scan function with
the following changes:

    - reorder local variables
    - use ether_addr_copy to copy ethernet addresses
    - change style in 'current_ev' variable assignments
    - make use of some ternaries avoiding if-else code
    - use preferred style for comments
    - extract common code into a new ks_wlan_add_leader_event
      function

After this changes readability has been improved.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>