clk: renesas: cpg-mssr: Use [] to denote a flexible array member

Flexible array members should be denoted using [] instead of [0], else
gcc will not warn when they are no longer at the end of the structure.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>

drivers/clk/renesas/renesas-cpg-mssr.c

@@ -450,7 +450,7 @@ static void __init cpg_mssr_register_mod_clk(const struct mssr_mod_clk *mod,
 struct cpg_mssr_clk_domain {
 	struct generic_pm_domain genpd;
 	unsigned int num_core_pm_clks;
-	unsigned int core_pm_clks[0];
+	unsigned int core_pm_clks[];
 };
 
 static struct cpg_mssr_clk_domain *cpg_mssr_clk_domain;