When a driver successfully created a device on demand, we can directly pick up the DEVFS inode number from the dev_t and find our directory entry from that, we don't need to scan the directory to find it.
When a driver successfully created a device on demand, we can directly
pick up the DEVFS inode number from the dev_t and find our directory
entry from that, we don't need to scan the directory to find it.

This also solves an issue with on-demand devices in subdirectories.

Submitted by:	cognet

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