Comment 13 for bug 1879325

I reach the upper virFileGetXAttrQuiet

Thread 3.1 "libvirtd" hit Breakpoint 10, virFileGetXAttrQuiet (path=path@entry=0x7f8c50041390 "/var/lib/uvtool/libvirt/images/testguest-ds.qcow",
    name=name@entry=0x7f8c1803dc40 "trusted.libvirt.security.ref_dac", value=value@entry=0x7f8c29b605e0) at ../../../src/util/virfile.c:4418

And it is the implementation of

4412 #else /* !HAVE_LIBATTR */
4413
4414 int
4415 virFileGetXAttrQuiet(const char *path G_GNUC_UNUSED,
4416 const char *name G_GNUC_UNUSED,
4417 char **value G_GNUC_UNUSED)
4418 {
4419 errno = ENOSYS;
4420 return -1;
4421 }

which is our ENOSYS.

There are two issues with that.
#1 - why do we have !HAVE_LIBATTR
#2 - I think never having set any XATTR the driver shouldn't bail out unable to remove them