staging: rtl8188eu: convert rtw_hal_antdiv_before_linked() to bool

Function rtw_hal_antdiv_before_linked() returns boolean values, so
change the return type from u8 to bool.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200114134422.13598-2-straube.linux@gmail.com


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