vfio-user: avoid leaking duplicate device name

vfio_user_pci_realize() assigns vbasedev->name before connecting to the server, then assigns the same name again after installing the request handler. The second assignment overwrites the first allocation, so only the second string can be freed later by vfio_device_free_name(). Drop the duplicate assignment and keep the first name allocation, which is also available on connection failures for error reporting. Fixes: 36227628d824 ("vfio-user: implement message send infrastructure") Signed-off-by: GuoHan Zhao <zhaoguohan@kylinos.cn> Reviewed-by: John Levon <john.levon@nutanix.com> Link: https://lore.kernel.org/qemu-devel/20260424032209.297458-1-zhaoguohan@kylinos.cn Signed-off-by: Cédric Le Goater <clg@redhat.com>