util: Fix error path in virSCSIVHostOpenVhostSCSI

We cannot be sure someone initialized the passed *vhostfd and we
certainly don't want or need to be calling VIR_FORCE_CLOSE on what
probably is -1. So let's just return -1 immediately.

src/util/virscsivhost.c

@@ -87,7 +87,7 @@ int
 virSCSIVHostOpenVhostSCSI(int *vhostfd)
 {
     if (!virFileExists(VHOST_SCSI_DEVICE))
-        goto error;
+        return -1;
 
     *vhostfd = open(VHOST_SCSI_DEVICE, O_RDWR);