clk: hisilicon: Use devm_kmalloc_array() in hisi_clk_alloc()

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

  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.c

@@ -54,7 +54,8 @@ struct hisi_clock_data *hisi_clk_alloc(struct platform_device *pdev,
 	if (!clk_data->base)
 		return NULL;
 
-	clk_table = devm_kmalloc(&pdev->dev, sizeof(struct clk *) * nr_clks,
+	clk_table = devm_kmalloc_array(&pdev->dev, nr_clks,
+				       sizeof(*clk_table),
 				       GFP_KERNEL);
 	if (!clk_table)
 		return NULL;