qemuFDPassTransferCommand: Mark that FD was passed

Until now the code didn't expect that we'd want to rollback/detach a FD
passed on the commandline, but whith disk backend FD passing this can
happen.

Properly mark the 'qemuFDPass' object as passed to qemu even when it was
done on the commandline.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>

src/qemu/qemu_fd.c

@@ -151,6 +151,8 @@ qemuFDPassTransferCommand(qemuFDPass *fdpass,
         fdpass->fds[i].fd = -1;
         virCommandAddArgList(cmd, "-add-fd", arg, NULL);
     }
+
+    fdpass->passed = true;
 }