staging: rtl8712: remove unnecessary parentheses

Reported by checkpatch:

Remove unnecessary parentheses around structure field references

Signed-off-by: Alaa Mohamed <eng.alaamohamedsoliman.am@gmail.com>
Link: https://lore.kernel.org/r/20220407125947.8525-1-eng.alaamohamedsoliman.am@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>