Add the missing return value documentation to the linuxdoc comment block
for the of_address_to_resource() function.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/61ffcb5e87511dfa21af169efd04806101c48b8a.1680248888.git.geert+renesas@glider.beSigned-off-by: Rob Herring <robh@kernel.org>