This commit brings things back to the well known working state of the command. - With commitmaster9620d87259
(cmd/fdt: support single value replacement within an array) there was an error introduced modifying (inserting) a property to a device-tree node. fdt_getprop(...) returnes a len with -1 for a non-existing property, but a memcpy with len -1 isn't a good idea and things went wrong (crash). - Some times later Tom did repair this with commit99bb38e2cc
(fdt: Check for NULL return from fdt_getprop in 'fdt set') This repairs the crash but the behaviour of the command isn't like before, it makes it impossible to insert a property. - Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at> Acked-by: Simon Glass <sjg@chromium.org>
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