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With -Wsign-compare, compilers warn about a mismatching signedness in a comparison in fdt_resize(). A negative buffer size will surely do us no good, so let's rule this case out first. In the actual comparison we then know that a cast to an unsigned type is safe. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Message-Id: <20200921165303.9115-10-andre.przywara@arm.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>