staging: rtl8188eu: Fixed "Missing a blank line after declarations".

Fixed checkpatch.pl "missing a blank line after declarations" waring
messages from rtl8188eu module.

Signed-off-by: Yamanappagouda Patil <goudapatilk@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>