staging: r8188eu: os_dep: Change the return type of function

Change the return type of rtw_init_default_value function
from u8 to void. This function always return success. This
is called from rtw_init_drv_sw where the return value from
this function is assign to local variable but the local variable
value is never checked. After change the return type to void
remove the local variable ret8 in rtw_init_drv_sw function.

Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Link: https://lore.kernel.org/r/YYgCHkVXFQ4r9dVp@Sauravs-MacBook-Air.local


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