clk: uniphier: fix memory overrun bug

The first loop of this "for" statement writes memory beyond the
allocated clk_hw_onecell_data.

It should be:
for (clk_num--; clk_num >= 0; clk_num--)
...

Or more simply:
while (--clk_num >= 0)
...

Fixes: 734d82f4a678 ("clk: uniphier: add core support code for UniPhier clock driver")
Signed-off-by: Masahiro Yamada <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/uniphier/clk-uniphier-core.c

···
 	hw_data->num = clk_num;
 
 	/* avoid returning NULL for unused idx */
-	for (; clk_num >= 0; clk_num--)
+	while (--clk_num >= 0)
 		hw_data->hws[clk_num] = ERR_PTR(-EINVAL);
 
 	for (p = data; p->name; p++) {