staging: rtl8712: remove unnecessary parentheses

Remove unnecessary parentheses around variables to conform to the Linux
kernel coding style. Issue found using checkpatch.

Signed-off-by: Arushi Singhal <arushisinghal19971997@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>