[PATCH] wait_for_sysfs update for dm devices

[PATCH] wait_for_sysfs update for dm devices

Hi,

I got these when creating LVM2 snapshots:

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| Oct 17 04:23:09 server wait_for_sysfs[5120]: error: wait_for_sysfs needs an update to handle the device '/block/dm-6' properly, please report to <linux-hotplug-devel@lists.sourceforge.net>
| Oct 17 04:23:09 server wait_for_sysfs[5129]: error: wait_for_sysfs needs an update to handle the device '/block/dm-6' properly, please report to <linux-hotplug-devel@lists.sourceforge.net>
| Oct 17 04:23:09 server wait_for_sysfs[5131]: error: wait_for_sysfs needs an update to handle the device '/block/dm-7' properly, please report to <linux-hotplug-devel@lists.sourceforge.net>
| [...]
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