wusb: fix find_first_zero_bit() return value check

In wusb_cluster_id_get(), if no zero bits exist in wusb_cluster_id_table,
find_first_zero_bit() returns CLUSTER_IDS.

But it is impossible to detect that the bitmap is full because there
is an off-by-one error in the return value check. It will cause
unexpected memory access by setting bit out of wusb_cluster_id_table
bitmap, and caller will get wrong cluster id.

Signed-off-by: Akinobu Mita <[e-mail]>
Cc: [e-mail]
Cc: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/wusbcore/wusbhc.c

···
 	u8 id;
 	spin_lock(&wusb_cluster_ids_lock);
 	id = find_first_zero_bit(wusb_cluster_id_table, CLUSTER_IDS);
-	if (id > CLUSTER_IDS) {
+	if (id >= CLUSTER_IDS) {
 		id = 0;
 		goto out;
 	}