staging: rtl8712: init_default_value(): Change return type

Change return type of init_default_value from u8 to void as it always
returns _SUCCESS. Remove now-unnecessary return statement.
Modify call site to simply call the function.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190808064012.12661-6-nishkadg.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>