ubd_drv: update io->addr for UBD_IO_COMMIT_AND_FETCH_REQ

Now we only update io->addr for UBD_IO_FETCH_REQ command which is
issued when starting device, this way requires that buffer has to
be pre-allocated, and not flexible enough.

Update io->addr in both UBD_IO_FETCH_REQ and
UBD_IO_COMMIT_AND_FETCH_REQ, then application can cover buffer
allocation, such as take the buffer for post-handling request,
then complete the request with new buffer.

Signed-off-by: Ming Lei <ming.lei@redhat.com>

drivers/block/ubd/ubd_drv.c

@@ -655,6 +655,7 @@ static int ubd_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
 		io->addr = ub_cmd->addr;
 		break;
 	case UBD_IO_COMMIT_AND_FETCH_REQ:
+		io->addr = ub_cmd->addr;
 		io->flags |= UBD_IO_FLAG_ACTIVE;
 		fallthrough;
 	case UBD_IO_COMMIT_REQ: