dtc: Remove bogus break statement

[Jon Loeliger]

So, like, the other day David Gibson mumbled:
> Commit 0738774fcc34b78a708a127fb4b2f193d08c94ba introduced some
> incorrect indentation / bracketing in unflatten_tree().  By luck, the
> extra break statement intended to be within an if block, but actually
> afterwards has no semantic effect.  Still, this patch gets rid of it
> for cleanliness.
> 
> Signed-off-by: David Gibson <david at gibson.dropbear.id.au>

Applied.

Thanks,
jdl