staging:rtl8188eu Add spaces around binary operator

Add spaces around binary operator '&' in order to
increase the readability of the code.

Signed-off-by: Georgiana Rodica Chelu <georgiana.chelu93@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>