staging: ks7010: ks_wlan_net: Remove unnecessary variable used to store return value

Remove unneeded code in order to make clear
that the function returns 0(success) in all cases.

Done using returnvar.cocci script.

Signed-off-by: Georgiana Rodica Chelu <georgiana.chelu93@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>