staging: rtl8188eu: remove nic_hdl from struct mlme_priv

struct mlme_priv is an element of struct adapter. Use container_of
to get a pointer to the enclosing struct.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210506121410.17613-1-martin@kaiser.cx


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