qemu: Check return code from qemuHostdevPrepareSCSIDevices

Signed-off-by: NEric Farman <farman@linux.vnet.ibm.com>
(cherry picked from commit 2dc94c3c)

src/qemu/qemu_hotplug.c

@@ -2468,7 +2468,7 @@ qemuDomainAttachHostSCSIDevice(virConnectPtr conn,
     }
 
     if (qemuHostdevPrepareSCSIDevices(driver, vm->def->name,
-                                      &hostdev, 1)) {
+                                      &hostdev, 1) < 0) {
         virDomainHostdevSubsysSCSIPtr scsisrc = &hostdev->source.subsys.u.scsi;
         if (scsisrc->protocol == VIR_DOMAIN_HOSTDEV_SCSI_PROTOCOL_TYPE_ISCSI) {
             virDomainHostdevSubsysSCSIiSCSIPtr iscsisrc = &scsisrc->u.iscsi;