tip.git regression from "vsprintf: unify the format decoding layerfor its 3 users"

[Jeremy Fitzhardinge]

Change fef20d9c1380f04ba9492d6463148db07b413708, "vsprintf: unify the 
format decoding layer for its 3 users", causes a regression in xenbus 
which results in no devices getting attached to a new domain.  Reverting 
fef20d9c1380f04ba9492d6463148db07b413708 and 
39e874f8afbdb3745e2406ce4ecbde9ac4cbaa78 fixes the problem.

I haven't identified what format string is being handled wrongly, so I 
don't know what the precise bug is.  The most complex looking format in 
use seems to be %.*s; there's also "%s/%s", "%i" and "%lX".

   J
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