qemu: Remove extra messages for vhost-scsi hotplug

As with virtio-scsi, the "internal error" messages after
preparing a vhost-scsi hostdev overwrites more meaningful
error messages deeper in the callchain.  Remove it too.
Signed-off-by: NEric Farman <farman@linux.vnet.ibm.com>
(cherry picked from commit 6ff38cee)

src/qemu/qemu_hotplug.c

@@ -2578,13 +2578,8 @@ qemuDomainAttachSCSIVHostDevice(virQEMUDriverPtr driver,
         return -1;
     }
 
-    if (qemuHostdevPrepareSCSIVHostDevices(driver, vm->def->name, &hostdev, 1) < 0) {
-        virDomainHostdevSubsysSCSIVHostPtr hostsrc = &hostdev->source.subsys.u.scsi_host;
-        virReportError(VIR_ERR_INTERNAL_ERROR,
-                       _("Unable to prepare scsi_host hostdev: %s"),
-                       hostsrc->wwpn);
+    if (qemuHostdevPrepareSCSIVHostDevices(driver, vm->def->name, &hostdev, 1) < 0)
         return -1;
-    }
 
     if (qemuDomainNamespaceSetupHostdev(driver, vm, hostdev) < 0)
         goto cleanup;