scsi: aacraid: Fix double-free on probe failure

aac_probe_one() calls hardware-specific init functions through the
aac_driver_ident::init pointer, all of which eventually call down to
aac_init_adapter().

If aac_init_adapter() fails after allocating memory for aac_dev::queues,
it frees the memory but does not clear that member.

After the hardware-specific init function returns an error,
aac_probe_one() goes down an error path that frees the memory pointed to
by aac_dev::queues, resulting.in a double-free.
Reported-by: Michael Gordon <m.gordon.zelenoborsky@gmail.com>
Link: https://bugs.debian.org/1075855
Fixes: 8e0c5ebd ("[SCSI] aacraid: Newer adapter communication iterface support")
Signed-off-by: Ben Hutchings <benh@debian.org>
Link: https://lore.kernel.org/r/ZsZvfqlQMveoL5KQ@decadent.org.ukSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/aacraid/comminit.c

@@ -642,6 +642,7 @@ struct aac_dev *aac_init_adapter(struct aac_dev *dev)
 
 	if (aac_comm_init(dev)<0){
 		kfree(dev->queues);
+		dev->queues = NULL;
 		return NULL;
 	}
 	/*
@@ -649,6 +650,7 @@ struct aac_dev *aac_init_adapter(struct aac_dev *dev)
 	 */
 	if (aac_fib_setup(dev) < 0) {
 		kfree(dev->queues);
+		dev->queues = NULL;
 		return NULL;
 	}