clk: sunxi: Fix checking return value of clk_register_[composite|factors]
clk_register_composite() and clk_register_factors() return ERR_PTR on error. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
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