staging: r8188eu: remove empty function __nat25_db_print

The definition of function __nat25_db_print is empty. Remove it.

Signed-off-by: Abdun Nihaal <abdun.nihaal@gmail.com>
Link: https://lore.kernel.org/r/98d201e029dba9acf707ed020b5a5604029ca710.1644422181.git.abdun.nihaal@gmail.com


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