staging: rtl8188eu: remove parenthesis from right hand side of assignment

Parenthesis are not needed around the right hand side of an assignment.
This patch was made on the core files of rtl8188eu using the following
coccinelle script.

@@
binary operator op = {==,!=,&&,||,>=,<=,&,|};
expression l, r, t;
@@

(
l = (r op t)
|
l =
-(
r
-)
)

Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>