clk: make sure parent is not NULL in clk_fetch_parent_index()
If parent is given with NULL, clk_fetch_parent_index() could return a positive index value. Currently, parent is checked by the callers of this function, but it would be safer to do it in this function. 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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