staging: wilc1000: remove return statement

This patch removes return statement that is always returned 0.
wilc_setup_ipaddress can not run to the end due to return statement.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>