staging: r8188eu: remove wait_ack param from _issue_probereq_p2p

The only caller of _issue_probereq_p2p sets wait_ack = false. Remove the
wait_ack parameter and the code that would run only if wait_ack == true.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20221023170808.46233-5-martin@kaiser.cx


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