staging: rtl8188eu: remove unnecessary ternary operator

The field accept_addba_req of struct mlme_ext_info has type bool.
Use the value of accept_addba_req directly instead of the ternary
operator in an asignment.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>