staging: vt6556: Remove double parentheses

This patch cleanup a checkpatch warning by removing double parentheses
from if condition. Additionally it fixes a line over 80 chars.

Tested by compilation only.

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>