staging: rtl8723bs: remove meaningless pstat->passoc_req check in OnAssocReq()

kfree(NULL) is safe and the check 'if (pstat->passoc_req)' before kfree
is not necessary.

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Longji Guo <guolongji@uniontech.com>
Link: https://lore.kernel.org/r/20210929110613.29979-1-guolongji@uniontech.com


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