ahci: clear aiocb in ncq_cb

Similar to existing fixes for IDE (87ac25f) and ATAPI (7f951b2), the
AIOCB must be cleared in the callback. Otherwise, we may accidentally
try to reset a dangling pointer in bdrv_aio_cancel() from a port reset.

Signed-off-by: John Snow <[email protected]>
Reviewed-by: Stefan Hajnoczi <[email protected]>
Message-id: [email protected]
Signed-off-by: John Snow <[email protected]>
Signed-off-by: Michael Roth <[email protected]>

Author: jnsnow

hw/ide/ahci.c

@@ -948,6 +948,7 @@ static void ncq_cb(void *opaque, int ret)
     NCQTransferState *ncq_tfs = (NCQTransferState *)opaque;
     IDEState *ide_state = &ncq_tfs->drive->port.ifs[0];
 
+    ncq_tfs->aiocb = NULL;
     if (ret == -ECANCELED) {
         return;
     }