[PATCH] sbp2: fix check of return value of hpsb_allocate_and_register_addrspace()

From: Stefan Richter <[e-mail]>

I added a failure check in patch "sbp2: variable status FIFO address (fix
login timeout)" --- alas for a wrong error value. This is a bug since
Linux 2.6.16. Leads to NULL pointer dereference if the call failed, and
bogus failure handling if call succeeded.

Signed-off-by: Stefan Richter <[e-mail]>
Cc: <[e-mail]>
Cc: Ben Collins <[e-mail]>
Cc: Jody McIntyre <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/ieee1394/sbp2.c

···
 			&sbp2_highlevel, ud->ne->host, &sbp2_ops,
 			sizeof(struct sbp2_status_block), sizeof(quadlet_t),
 			0x010000000000ULL, CSR1212_ALL_SPACE_END);
-	if (!scsi_id->status_fifo_addr) {
+	if (scsi_id->status_fifo_addr == ~0ULL) {
 		SBP2_ERR("failed to allocate status FIFO address range");
 		goto failed_alloc;
 	}