staging: unisys: visorbus: Don't check for more than PAGE_SIZE length in visorbus

Since a sysfs entry is allocated 1 page of memory (4096 bytes) by default,
there is no need to enforce this limit in the driver. This patch corrects
visorbus/visorbus_main.c.

Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David Binder <david.binder@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>