clk: visconti: Switch to use kmemdup_array()

Let the kmemdup_array() take care about multiplication and possible
overflows.

Signed-off-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/visconti/pll.c

···
 	for (len = 0; rate_table[len].rate != 0; )
 		len++;
 	pll->rate_count = len;
-	pll->rate_table = kmemdup(rate_table,
-				  pll->rate_count * sizeof(struct visconti_pll_rate_table),
-				  GFP_KERNEL);
+	pll->rate_table = kmemdup_array(rate_table,
+					pll->rate_count, sizeof(*pll->rate_table),
+					GFP_KERNEL);
 	WARN(!pll->rate_table, "%s: could not allocate rate table for %s\n", __func__, name);
 
 	init.ops = &visconti_pll_ops;