lsblk: don't ask udev when --sysroot specified

We use --sysroot to get information about block devices from /proc and
/sys dumps. In this case does not make sense to read anything from
udev as udevd is about the current system devices.

Signed-off-by: Karel Zak <kzak@redhat.com>

misc-utils/lsblk.c

@@ -562,6 +562,8 @@ static int get_udev_properties(struct blkdev_cxt *cxt)
 
 	if (cxt->probed)
 		return 0;		/* already done */
+	if (lsblk->sysroot)
+		return -1;		/* don't ask udev when read from data from dump */
 
 	if (!udev)
 		udev = udev_new();