Simon Glass b06750501f dm: core: Add uclass_first_device_err() to return a valid device ...

A common pattern is to call uclass_first_device() and then check if it
actually returns a device. Add a new function which does this, returning
an error if there are no devices in that uclass.

Signed-off-by: Simon Glass <sjg@chromium.org>

2016-03-14 15:34:50 -06:00

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