staging: r8188eu: convert rtw_p2p_set_go_nego_ssid to return void

rtw_p2p_set_go_nego_ssid always returns 0 and it's return value is not
used. Convert it to return void.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Abdun Nihaal <abdun.nihaal@gmail.com>
Link: https://lore.kernel.org/r/90e2b3e4ff99131423c11b8f9206916791f742d9.1643466748.git.abdun.nihaal@gmail.com


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