staging: r8188eu: convert rtw_usb_bulk_size_boundary() to bool

Function rtw_usb_bulk_size_boundary() returns boolean values.
Change its return type from u8 to bool.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220329103756.6740-4-straube.linux@gmail.com


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