scsi: fix cancellation when I/O was completed but DMA was not.
Commit d5776465 (scsi: Introduce scsi_req_cancel_complete, 2014-09-25) was supposed to have no semantic change, but it missed a case. When r->aiocb has already been NULLed, but DMA was not complete and the SCSI layer was waiting for scsi_req_continue, after the patch the SCSI layer will not call the .cancel callback of SCSIBusInfo. Fixes: d5776465 Cc: qemu-stable@nongnu.org Reported-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Tested-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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