clk: hi3620: Use kcalloc() in hi3620_mmc_clk_init()

* A multiplication for the size determination of a memory allocation
  indicated that an array data structure should be processed.
  Thus use the corresponding function "kcalloc".

  This issue was detected by using the Coccinelle software.

* Replace the specification of a data type by a pointer dereference
  to make the corresponding size determination a bit safer according to
  the Linux coding style convention.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/hisilicon/clk-hi3620.c

@@ -482,7 +482,7 @@ static void __init hi3620_mmc_clk_init(struct device_node *node)
 	if (WARN_ON(!clk_data))
 		return;
 
-	clk_data->clks = kzalloc(sizeof(struct clk *) * num, GFP_KERNEL);
+	clk_data->clks = kcalloc(num, sizeof(*clk_data->clks), GFP_KERNEL);
 	if (!clk_data->clks) {
 		pr_err("%s: fail to allocate mmc clk\n", __func__);
 		return;