staging: vt6655: Add spaces around operators

Add spaces around '*' and '-' to fix checkpatch issue.

Signed-off-by: Mamta Shukla <mamtashukla555@gmail.com>
Reviewed-by: Himanshu Jha <himanshujha199640@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>