USB: Only treat lasting over-current conditions as errors

On a laptop I see these errors on (most) resumes:
    hub 3-0:1.0: over-current change on port 1
    hub 3-0:1.0: over-current change on port 2

Since over-current conditions can disappear quite quickly it's better to
downgrade that message to debug level, recheck for an over-current
condition a little later and only print and over-current condition error
if that condition (still) exists when it's rechecked.

Add similar logic to hub over-current changes. (That code is untested,
as those changes do not occur on this laptop.)

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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