staging: rtl8192u: add space after close brace '}'

This fixes the checkpatch.pl error:
ERROR: space required after that close brace '}'

Signed-off-by: Roxana Blaj <roxanagabriela10@gmail.com>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>