staging:rtl8188eu:core Fix add spaces around &

This patch is created to solve the following coding style issue reported
by the checkpatch script.
CHECK: spaces preffered around that '&' (ctx:VxV)

Signed-off-by: Janani Sankara Babu <jananis37@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>