Re: libfdt: Add and use a node iteration helper function.

So, like, the other day David Gibson mumbled:

This patch adds an fdt_next_node() function which can be used to
iterate through nodes of the tree while keeping track of depth.  This
function is used to simplify the iteration code in a lot of other
functions, and is also exported for use by library users.

Signed-off-by: David Gibson <redacted>

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I think we're ready to go with this one.  I'm still thinking about
suitable for_each_* macros, but in the mean time I'm happy with the
exported interface here, and it's a code-reducing patch.

Applied.

Thanks,
jdl