staging: r8188eu: remove empty function rtw_mfree_mlme_priv_lock

The definition of function rtw_mfree_mlme_priv_lock is empty. Remove it.

Signed-off-by: Abdun Nihaal <abdun.nihaal@gmail.com>
Link: https://lore.kernel.org/r/8b6d750b049f875370996258aedaf89cf0f198d4.1644422181.git.abdun.nihaal@gmail.com


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