staging: unisys: visorbus: consolidate if statements

We had several if statements inside of if statements that should be
consolidated into an if statement with an && to clean up the code some
more.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>