staging: rtl8192e: Remove useless parentheses

Parentheses are not needed on the right side of assignment.

Additionally added space around '+'and '*' to remove
checkpatch issue, space required around '+' and '*'.

Parentheses Removed using the coccinelle script:
@@
binary operator bop = {+,-,>>,<<};
expression e, e1, e2;
@@

e =
-(
        e1 bop e2
-)

Signed-off-by: Gargi Sharma <gs051095@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>