staging: r8188eu: remove wait_ms parameter

Remove the wait_ms parameter from function issue_probereq_ex. There's only
one caller, who requests a waiting time of 1 ms.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20221126154253.178275-3-martin@kaiser.cx


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