clk: slightly optimize clk_core_set_parent()
If clk_fetch_parent_index() fails, p_rate is unused. Move the assignment after the error checking. Signed-off-by:Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by:
Vladimir Zapolskiy <vz@mleia.com> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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